The bug
Moving_Block do not tick past the worldborder causing them to stay offset / create a ghost block when pushed by a piston.
This seems like a regression of MC-54366
Pistons still try to push blocks through the worldborder, however they stay at the position they were as some kind of "ghost" blocks (very likely the piston_extension block, which the client still renders, however it doesn't exist anymore, /testforblock returns air). After reloading this area they are gone.
Code analysis
Based on 1.11 decompiled using MCP 9.35 rc1
The method net.minecraft.block.BlockPistonBase.canPush(IBlockState, World, BlockPos, EnumFacing, boolean) only tests if the position of the block to move is inside the worldborder, but not if the new position is inside it as well.
The reason why the piston_extension tile entity is not removed is because the method net.minecraft.world.World.updateEntities() removes only invalid tile entities inside the worldborder.
Related issues
is duplicated by
MC-156127
Phantom blocks
MC-74543
Ghost Blocks
MC-74702
Block and sticky piston fuse at world border
MC-82327
Blocks glitch screen if pushed by piston (world border)
MC-92573
Border Bug?
MC-95342
Worldborder Causing 2 blocks in the same block space
MC-110117
Pisto extends in piston and ghost block
MC-110570
block intro block world border
MC-127654
A block bug
MC-130472
Piston and block Bug.
MC-134764
Blocks Out Of World Border
MC-145224
The block became air
MC-156511
Block doesn't dissapear when pushed outside the world border
MC-158965
Ghost blocks/overlaping blocks created in world border
MC-160953
Piston pushes block into world border and glitches texture
MC-160955
Block can't be destoryed after pushing piston through world border
MC-180218
You can Push a block through the Worldborder
MC-194704
Ghost block creation on the world border
MC-195972
At the word border, you can push block into block,
MC-197685
Piston with blocks bugged on world border barrier.
MC-197976
Ghost blocks made when pushing a block into the world border with a piston.
MC-198627
You can push block in block by piston near to the world border
MC-220117
Z fighting with ghost blocks
MC-220717
Piston Head Glitch
MC-223410
2 blocks combine with each other
MC-228993
Block gets over world border and not back with sticky piston
MC-229021
Block moves in world border
MC-229471
Piston pushes blocks bugged through the worldborder
MC-231868
two variant double slab in world border
MC-232035
This at the worldborder and and everything is glitched gosh...
MC-232202
Immortal Slab at world border (Two different slabs on one block)
MC-237259
When a piston pushes against a slab at the worldborder, it will create a double slab.
MC-237286
Ghost block when using piston to push solid block into a non-solid block at border.
MC-237928
Half-Blocks error
MC-239956
Lightning Rod lost it hitbox with world border. [FR]
MC-266982
Chest in a glass
MC-267009
Blocks can be merged and ghost blocks can be created with pistons on worldborder
MC-268308
Block can't be destroyed after pushed against world border by a piston
MC-269923
Semi-blocks pushed by pistons at the border
MC-271328
Piston glitches into shulker when pushing it into the world border.
MC-271329
Block outline disappears after pushing block next/outside world border using piston
MC-280495
if yow "push" a block with a piston by the yorld border the block glitches out causing the piston head to glitch out really bad ant the block then cant be broken but also can be stood onn
Attachments
Comments
migrated
migrated
Pistons fail pushing blocks trough worldborder
Pistons can somehow still push blocks trough the worldborder
Your summary and description contradict each other.
marcono1234
I changed the description
migrated
Confirmed.
SunCat
Confirmed for 1.9
SunCat
Still in 16w15b
migrated
Confirmed for 1.13.2-pre2.
ZeNico13
Cannot reproduce in 1.14 pre-5. It seems to be patched.
[media]
Silicon42
@ZeNico13
From the looks of your video, your worldborder is not perfectly aligned to a block boundary, while the worldborder may not always visually line up perfectly with the edges of blocks, any blocks that it partially includes are treated as being within the worldborder. This means that you weren't actually pushing the blocks outside the worldborder.
migrated
Confirmed to still be in 1.14.4
Not sure if it's in the 1.15 snapshots
Avoma
Can confirm in 20w51a.
Jack McKalling
Ghost blocks also occur adjacent to the worldborder, if another block is pushed into them but then removed. They will remain visual as long as the world is loaded, and visually disappear but still remain when reloaded. Only upon moving the worldborder the block will become valid again.
This also applies to slabs and stairs being pushed into each other, producing visual double slabs/stairs from different, overlapping materials.
migrated
Not sure if this helps, but the block will disappear if tnt tries to explode it.
Just saying.
Former user
It is not a ghost blocks. It is a "moving_block". When a piston push a block, it creates a "moving block" outside of the worldborder.
migrated
Can confirm in 1.17.1
migrated
That was already marked as affected.
PR0CESS
I would like to ask that we rename this bug report from: Pistons fail pushing blocks through worldborder, creating ghost blocks to Moving_Block's do not tick past the world border causing them to stay offset when pushed by a piston
Cause the current title is completely inaccurate