MC-132898Multiple layers of falling gravity blocks break
A common style of "Portcullis gate" uses gravity blocks like sand or gravel to push up fence posts up by at least two layers. When the pistons retract, both layers should "resettle" as solid blocks as shown in the following video:
https://youtu.be/hISevc8lq_g
On Pre6, one of the layers "breaks" so there is now only a single layer, so the fence posts can only be pushed up by one layer and the gravity block items will despawn.
It looks like something changed in the falling entity timings such that one entity falling upon another becomes "broken" faster than as happened with prior versions. This will break all "falling sand" portcullises working in prior versions, and a work-around becomes a huge problem with double-retracting pistons to pull the "gate" back down.
Environment
Java server
Created Issue:
Multiple layers of falling gravity blocks break
A common style of "Portcullis gate" uses gravity blocks like sand or gravel to push up fence posts up by at least two layers. When the pistons retract, both layers should "resettle" as solid blocks as shown in the following video:
https://youtu.be/hISevc8lq_gOn Pre6, one of the layers "breaks" so there is now only a single layer, so the fence posts can only be pushed up by one layer and the gravity block items will despawn.
It looks like something changed in the falling entity timings such that one entity falling upon another becomes "broken" faster than as happened with prior versions. This will break all "falling sand" portcullises working in prior versions, and a work-around becomes a huge problem with double-retracting pistons to pull the "gate" back down.
Environment
Java server
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relates to
I had the following bug report: https://bugs.mojang.com/browse/MC-132898 "Multiple layers of falling gravity blocks break"
Is this bug MC-132706 the root cause of my bug MC-132898? I'll edit this message if it appears my bug is "fixed", and I'll note there as well as reference this bug as I think they may be related.
EDIT:
My issue is still unresolved in Pre7. In a double-layer of gravel blocks, one layer gets broken by a double-retraction. Is it appropriate then to assume that bug is not related to this bug? And would someone be able to confirm if they have the same item breaking when a gravity block in two or more layers breaks when pulled in a double-piston retraction?
This seems to be a repeat of bug MC-132898.
This is on a multiplayer server. When I stack two gravel blocks and raise them with two pistons (as in the gatehouse to raise a portcullis build) the top block breaks when they fall. This does not affect the gravel blocks on the existing gates I have. The existing gates work normally, however, if I break a gravel block on the original and then replace it, it breaks from that point forward.
This bug may be related to https://bugs.mojang.com/browse/MC-132706 though I'm not clear on the details. I have confirmed this is still an issue for me in Pre7.
Still broken in Pre8. Unfortunately, due to work commitments, I am not able to set up a proper test rig to verify specifics. I can verify that it is the top layer that breaks, using sand on top of the gravel layer. More details will come when I'm not working 12 days of 11 hrs a day. :-/
I believe this bug is either "connected with" or a "duplicate of"
MC-134300. In any case, the problem I was having with "Mumbo's Portcullis" is working in 18w30a. Please link this bug as "relates to"MC-134300(or flag this as a duplicate if appropriate) and set this "Resolved." If future updates seem to trigger this problem again I'll note it onMC-134300.