PaperMC / PaperMC/Paper

Entity loading

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status: needs triage
Dominant language
Java
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Description

Expected behavior

When reloading a chunk, entities should be in the exact same position that they were in when unloaded.

Observed/Actual behavior

On chunk reload, boats that are perched on top of a Wither's head while caged do not stay in the same position 100% of the time.

Steps/models to reproduce

Create a Wither cage that uses a boat to hold the Wither in place, reload the chunks either through relogging, switching dimensions, moving out of sim distance, etc. 1-10 times, the boat has a high probability to fall off of its head.

Plugin and Datapack List

unknown

Paper version

latest compatible with 1.21.8 snapshot

Other

No response

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the Wither-cage setup described in the issue, then test chunk reload through relogging, dimension changes, and moving out of simulation distance. Investigate entity loading for boats mounted on a Wither's head. Done means the boat remains in the exact same position after repeated reloads.

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
30/100

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