Inventory desync & block update happening when canceling lily pad in BlockPlaceEvent
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- Dominant language
- Java
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Description
Expected behavior
The lily pad item to remain in my inventory (without ghosting) & block updates to not happen when canceling the placement of a lily pad on water
Observed/Actual behavior
When a lily pad is placed on water and the BlockPlaceEvent is canceled, the item ghosts out of the player's inventory and a block update happens.
https://github.com/PaperMC/Paper/assets/13612979/78b1558e-c8f5-4d33-bdf3-5e8f53f74295
Steps/models to reproduce
- Install test plugin
- Create a floating body of water
- Place a lily pad on the water, observe item ghosted out of inventory & block update happened, causing water to flow
- Place a block on top of the water, no block update happened nor did the item go invisible
Plugin and Datapack List
WorldEdit + test plugin:
@EventHandler(ignoreCancelled = true)
public void onBlockPlace(BlockPlaceEvent event) {
if (event.getBlock().getType().equals(Material.LILY_PAD)) {
event.getPlayer().sendPlainMessage("Lilypad placed and canceled");
event.setCancelled(true);
}
if (event.getBlock().getType().equals(Material.STONE)) {
event.getPlayer().sendPlainMessage("Stone placed and canceled");
event.setCancelled(true);
}
}
Paper version
This server is running Paper version git-Paper-83 (MC: 1.20.1) (Implementing API version 1.20.1-R0.1-SNAPSHOT) (Git: c793bd9)
You are running the latest version
Other
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the canceled lily-pad placement with the test plugin described in the issue, then compare its inventory and block-update behavior with canceled stone placement. Done means the lily pad remains synchronized in the inventory and canceling its placement does not trigger a block update or water flow.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- game-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100