MC-276486The item transfer speed of hopper minecarts gets slower when empty hopper minecarts are placed within the minecart's item pickup range
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture 1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them from connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
The items get split over the four lower minecarts, as each minecart contains 16 items.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
The items do not get equally split: every minecart with a minecart above it gets approximately only half of the amount of items as a minecart without a minecart above it.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
Linked Issues
Created Issue:
The item transfer speed of hopper minecarts gets slower when empty hopper minecarts are placed within the minecart's item pickup range
The item transfer speed of a hopper minecartgets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart. It seems to be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts.
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![[Mod] turbo](../../../data/avatars/users/92867.png){kind=small}
The item transfer speed of a hopper minecartgets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
It seems to be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item.To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts.
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the varaiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the varaiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk are too big, I have uploaded them on a file sharing site. Here's the link: https://file.io/m52I7UtvJrJ5
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the varaiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using mca selector) are too big, I have uploaded them on a file sharing site. Here's the link: https://file.io/m52I7UtvJrJ5
I will add a video when I have time to do so.
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the varaiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using mca selector) are too big, I have uploaded them on a file sharing site. Here's the link: https://file.io/m52I7UtvJrJ5
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distributer in the picture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the varaiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using mca selector) are too big, I have uploaded them on dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
![[Mod] Jarl-Penguin](../../../data/avatars/users/92849.png){kind=small}
![[Mod] Jiingy](../../../data/avatars/users/91802.png){kind=small}
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribut
er in thepicture:
- Place 2 fences next to eachother with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
tedover the four lower minecarts, as each minecart contains 16 items.- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
ted: every minecart with a minecart above it gets approximately only half of the amount of items as a minecart without a minecart above it.This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item lookups will be in the empty minecart, this makes approximately half of the lookups wasted and thus halving the item transfer speed. It also explains the var
aiations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.Since the videos and exported chunk (using
mcaselector) are too big, I have uploaded them ondropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture_1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture
_1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture 1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them form connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture 1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them f
orm connecting with the lower rails. Make sure the result looks like picture 3.- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
The item transfer speed of a hopper minecart gets slower when new, empty hopper minecarts are placed within the item pickup area of the minecart.
To reproduce:
- First, build the item distribution setup from picture 1:
- Place 2 fences next to each other with rails pointing to them.
- Place four hopper minecarts on the rails and push them tightly against the fences. Make sure the result looks like picture 1.
- Now, remove the fences and use pistons to replace them with blocks. This can be easily done by placing blocks on top of the rails, as in picture 2.
- Remove the pistons and place a minecart on the two middle blocks, such that it overlaps with the two blocks. Do not place rail on the middle blocks to prevent them from connecting with the lower rails. Make sure the result looks like picture 3.
- Now, place a stack of items in the top minecart.
- Now, place a minecart (not on a rail) on one or more of the upper blocks and place again a stack of items in the middle minecart.
- If needed, confirm that the new hopper minecart is in the lower hopper minecart's item pickup zone by placing an item into the top minecart and notice that it gets removed.
This means that the items with a hopper minecart above it have a halved item transfer speed than items without, because they had only got a chance to pick up half the items as other minecarts. The speed doesn't seem to be constantly halved, as the distribution sometimes varies between different experiments with the same setup. It seems rather that the speed is on average halved, but varies over time. When placing a hopper minecart above all the four minecarts, we can see that the items get approximately distributed, but not equally, which proves this.
A possible explanation for this bug might be that the hopper minecart looks for an item in one hopper minecart every tick, but doesn't look in other minecarts at the same tick when it doesn't find an item. Since approximately half of the item look-ups will be in the empty minecart, this makes approximately half of the look-ups wasted and thus halving the item transfer speed. It also explains the variations in item transfer speed, since the minecart might be looking in the empty minecart more or less than half of the times at a given moment.
Since the videos and exported chunk (using MCA selector) are too big, I have uploaded them on Dropbox. Here's the link: https://www.dropbox.com/scl/fo/iie0tfh9cdaa6bwxi6hxv/AJ8tcAkEDEjDlmqvNrYwtBs?rlkey=nj17x9trmbvl3capdxmbda1wb&st=bxia389v&dl=0
![[Mojang] Timur Nazarov](../../../data/avatars/users/18945.svg){kind=small}
duplicates
Please attach a video, and a copy of the world. Rebuilding the set up is a bit redundant when it can be attached as a world file.
Since this issue is tagged as awaiting response again, I would like to notice that a link to the world file and videos has been added to the report.
And I would like to notice that I get an error message "The transfer you requested has been deleted".
Thanks for notifying me of the issue. I have updated the link with a dropbox link. I hope it works now, tell me if it doesn't. It would be a lot easier if I could just upload the files as an attachment to the issue.
Duplicate of MC-124099
Thank you for your report!
We're tracking this issue in MC-124099, so this ticket is being resolved and linked as a duplicate.
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