Usually when a powered rail, detector rail or activator rail gets destroyed it sends out block updates to the blocks diagonally below it.
In 17w50a, when you have a powered/detector/activator rail and you push it away with a piston, then it does not send out block updates diagonally below it.
This can cause some blocks to get into invalid states.
In
[media]you see a contraption. If you flick the lever, then you get
[media]. In this picture the powered rail on the lower block is in an invalid state because it´s on even though it is not powered by anything. That rail should have been updated when the upper powered rail was pushed away, but it wasn´t.
(Also this is not a duplicate of MC-96224, because the bug I´m describing here was newly introduced in the 1.13 snapshots and didn´t exist before, while MC-96224 is older, and secondly this bug is about block updates missing when a rail starts being pushed, while MC-96224 is about block updates missing when a rail finishes being pushed).
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This affects the following situations:
powered rails do not update their powered state
stairs do not update the shape
fences/walls/glass panes/iron bars do not update connections
support requiring blocks do not drop
gravity affected blocks do not fall
activated detector rails do not unpower redstone dust
redstone stays attached to wall
Related issues
is duplicated by
MC-123448
floating sand with piston and fence
MC-123449
pistons pulling moving blocks do not properly update surrounding blocks
MC-123451
bed does not delete when retrieving blocks under it with piston
MC-123452
stair remain in rotated state when spam pushed with piston
MC-123922
stair block does not update after retracted with piston
MC-125831
Redstone dust rendering on sides of blocks when the redstone has been disconnected
MC-131332
Redstone staying on walls
MC-137137
Blocks powered from detector rails remain powered when rail is moved
MC-168724
Floting Sand
MC-197927
Piston being able to hold up an unsupported falling block
MC-198422
Gravity blocks not falling when pushed by pistons
MC-203724
Floating sand placing while two pistons pushing at once
MC-234794
Floating Gravity Blocks
relates to
MC-276157
Floating rails can be created with a certain setup
MC-122785
Powered rails and activator rails do not transmit power downwards or upwards when placed next to a power source
MC-174864
Rails update other rails before checking if they are in a valid location when moved by pistons
MC-122270
Pushing blocks with connections doesn't update them
Attachments
Comments
migrated
violine1101
This appears to be fixed in 18w01a.
violine1101
Reopened, see MC-123922
migrated
even the rail bug originally from that bug isn't fixed yet
Bug stair: https://imgur.com/jcjT7q0
Bug rail: https://imgur.com/onBgND9
migrated
This bug is still present in 18w08b.
It also happens with plants.
FivesBlue
Can confirm for 1.16.4
migrated
Affects 20w46a
Avoma
Can confirm in 20w51a.
migrated
Can confirm on 1.16.5, Paper multiplayer server, latest build.
Avoma
Can confirm in 21w03a.
Avoma
Can confirm in 21w05b.
Mask3D_WOLF
Requesting ownership as the current reporter has been inactive since 2018
Avoma
Can confirm in 21w07a.
PR0CESS
Can confirm in 1.17 pre-1
Myren is actually still active, you can send him a message on discord.
Minecraft386882
Confirmed in 1.21.3