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Paste breaks and never replaces extended pistons #2956
Description
WorldEdit Version
7.4.3-beta-01+80c6d6122
Platform Version
Fabric 0.19.2
Confirmations
- I am using the most recent Minecraft release.
- I am using a version of WorldEdit compatible with my Minecraft version.
- I am using the latest or recommended version of my platform software.
- I am NOT using a hybrid server, e.g. a server that combines Bukkit and Forge. Examples include Arclight, Mohist, and Cardboard.
- I am NOT using a fork of WorldEdit, such as FastAsyncWorldEdit (FAWE) or AsyncWorldEdit (AWE)
Bug Description
Basically when I use the paste command it tries to replace extended pistons with another extended or non-extended piston but instead I see break particles and the piston just never replaces.
Expected Behavior
It should be able to replace it correctly instead of just dissapearing
Reproduction Steps
- Copy a piston
- Paste a piston over an extended piston
Anything Else?
No response
Activity
github-actions commentedon May 23, 2026
This issue has been automatically marked as stale because it has not been fully confirmed. It will be closed if no further activity occurs. Thank you for your contributions.
github-actions commentedon Jun 23, 2026
This issue has been automatically marked as stale because it has not been fully confirmed. It will be closed if no further activity occurs. Thank you for your contributions.
github-actions commentedon Jul 24, 2026
This issue has been automatically marked as stale because it has not been fully confirmed. It will be closed if no further activity occurs. Thank you for your contributions.
github-actions commentedon Aug 24, 2026
This issue has been automatically marked as stale because it has not been fully confirmed. It will be closed if no further activity occurs. Thank you for your contributions.
VanJackal commentedon Aug 26, 2026
I looked into this a bit in game. It appears to happen anytime a piston head attached to an extended piston is replaced with a piston head (or any block
except air). Not sure if it's relevant but vanilla fill/setblock doesn't have this issue unless the head is replaced by something other than a piston head.edit: tried again with air and it broke the piston, not sure what I did the first time
VanJackal commentedon Aug 28, 2026
This seems to be caused by
WorldEdit/worldedit-core-mc/src/main/java/com/sk89q/worldedit/coremc/internal/CoreMcWorldNativeAccess.java
Line 169 in dca1073
Which causes the piston head to destroy the piston base (see
net.minecraft.world.level.block.piston.PistonHeadBlock#affectNeighborsAfterRemoval)Potential fix is checking if the block has changed before calling
affectNeighborsAfterRemoval, which is what vanilla does.