You cannot replace blocks supporting stalactites without the stalactites falling
The Bug:
You cannot replace blocks supporting stalactites without the stalactites falling.
This issue is exclusive to stalactites (pointed dripstone facing downwards) and cannot be reproduced with stalagmites (pointed dripstone facing upwards). Please also note that if the entire stalactite consists of a maximum of one block and doesn't have air below it, the block that's supporting the stalactite can be successfully replaced without the stalactite falling. This is the only exception to this problem.
Steps to Reproduce:
- Construct a stalactite of any size.
- Switch into creative mode and attempt to replace the block that's supporting the stalactite by pressing the "Attack/Destroy" and "Use Item/Place Block" buttons simultaneously.
- Watch the stalactite closely as it supporting block is replaced.
- Take note as to whether or not you can replace blocks supporting stalactites without the stalactites falling.
Observed Behavior:
You cannot replace blocks supporting stalactites without the stalactites falling.
Expected Behavior:
You would be able to replace blocks supporting stalactites without the stalactites falling.
Created Issue:
You cannot replace blocks supporting pointed dripstone without it breaking
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
Information:
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall in order to experience this problem.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
Information:
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall
in order to experience this problem.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
Information:
Th
is issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
Expected Behavior:
The expected behavior would be that you are able to replace blocks supporting pointed dripstone without it breaking.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
- →
Notice how you cannot replace blocks supporting pointed dripstone without it breaking.
Expected Behavior:
The expected behavior would be that you are able to replace blocks supporting pointed dripstone without it breaking.The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left Click + Right Click at the same time whilst in creative mode).
Observed Behavior:
You cannot replace blocks supporting pointed dripstone without it breaking.
Expected Behavior:
You would be able to replace blocks supporting pointed dripstone without it breaking.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left
Click +RightClick at the same time whilst in creative mode).Observed Behavior:
You cannot replace blocks supporting pointed dripstone without it breaking.
Expected Behavior:
You would be able to replace blocks supporting pointed dripstone without it breaking.
The Bug:
You cannot replace blocks supporting pointed dripstone without it breaking.
This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
- Attempt to replace the diamond block with a gold block. (Left-click + right-click at the same time whilst in creative mode).
- Take note as to whether or not you can replace blocks supporting pointed dripstone without it breaking.
Observed Behavior:
You cannot replace blocks supporting pointed dripstone without it breaking.
Expected Behavior:
You would be able to replace blocks supporting pointed dripstone without it breaking.
The Bug:
You cannot replace blocks supporting
pointed dripstone without it breaking.This issue cannot be reproduced with a singular stalactite or stalagmite. It must be at least 2 blocks tall.
Steps to Reproduce:
- Build the setup shown in the attachment below. [^setup.png]
Attempt to replace the diamond block with a gold block. (Left-click + right-click at the same timewhilst in creative mode).- Take note as to whether or not you can replace blocks supporting
pointed dripstone without it breaking.Observed Behavior:
You cannot replace blocks supporting
pointed dripstone without it breaking.Expected Behavior:
You would be able to replace blocks supporting
pointed dripstone without it breaking.The Bug:
You cannot replace blocks supporting stalactites without the stalactites falling.
This issue is exclusive to stalactites (pointed dripstone facing downwards) and cannot be reproduced with stalagmites (pointed dripstone facing upwards). Please also note that if the entire stalactite consists of a maximum of one block and doesn't have air below it, the block that's supporting the stalactite can be successfully replaced without the stalactite falling. This is the only exception to this problem.
Steps to Reproduce:
- Construct a stalactite of any size.
- Replace the block that's supporting the stalactite by pressing the "Attack/Destroy" and "Use Item/Place Block" buttons simultaneously whilst in creative mode.
- Pay close attention to the stalactite.
- Take note as to whether or not you can replace blocks supporting stalactites without the stalactites falling.
Observed Behavior:
You cannot replace blocks supporting stalactites without the stalactites falling.
Expected Behavior:
You would be able to replace blocks supporting stalactites without the stalactites falling.
You cannot replace blocks supportingpointed dripstone without it breakingYou cannot replace blocks supporting stalactites without the stalactites falling
The Bug:
You cannot replace blocks supporting stalactites without the stalactites falling.
This issue is exclusive to stalactites (pointed dripstone facing downwards) and cannot be reproduced with stalagmites (pointed dripstone facing upwards). Please also note that if the entire stalactite consists of a maximum of one block and doesn't have air below it, the block that's supporting the stalactite can be successfully replaced without the stalactite falling. This is the only exception to this problem.
Steps to Reproduce:
- Construct a stalactite of any size.
Replace the block that's supporting the stalactite by pressing the "Attack/Destroy" and "Use Item/Place Block" buttons simultaneouslywhilst in creative mode.Pay close attention to the stalactite.- Take note as to whether or not you can replace blocks supporting stalactites without the stalactites falling.
Observed Behavior:
You cannot replace blocks supporting stalactites without the stalactites falling.
Expected Behavior:
You would be able to replace blocks supporting stalactites without the stalactites falling.
The Bug:
You cannot replace blocks supporting stalactites without the stalactites falling.
This issue is exclusive to stalactites (pointed dripstone facing downwards) and cannot be reproduced with stalagmites (pointed dripstone facing upwards). Please also note that if the entire stalactite consists of a maximum of one block and doesn't have air below it, the block that's supporting the stalactite can be successfully replaced without the stalactite falling. This is the only exception to this problem.
Steps to Reproduce:
- Construct a stalactite of any size.
- Switch into creative mode and attempt to replace the block that's supporting the stalactite by pressing the "Attack/Destroy" and "Use Item/Place Block" buttons simultaneously.
- Watch the stalactite closely as it supporting block is replaced.
- Take note as to whether or not you can replace blocks supporting stalactites without the stalactites falling.
Observed Behavior:
You cannot replace blocks supporting stalactites without the stalactites falling.
Expected Behavior:
You would be able to replace blocks supporting stalactites without the stalactites falling.

Relates to MC-213961.
Can confirm.
Can confirm in 21w40a.
The behavior of this issue has changed slightly; this no longer affects pointed dripstones that have their "vertical_direction" set to "up". In other words, this behavior is now exclusive to stalactites and not stalagmites. I've updated this ticket to reflect this new information.
Can confirm in 1.20.4.
Related to
MC-213961