Flying machines are destroyed after a restart
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Description
Expected behavior
When saving the world, running flying machines are saved correctly.
After the world is loaded, the flying machines continue their movement.
Observed/Actual behavior
When saving or loading the world, it happens that the constructions are torn apart or do not continue their movement. It has also been reported that they have duplicated. We have not been able to reproduce this so far.
It is observed after the update from 1.19.2 to 1.19.4.


Steps/models to reproduce
@kennytv Has a server with a world to reproduce.
Steps to reproduce:
- Start server and enter.
- Activate flying machines via noteblocks.
- Leave server
- Restart server
- Enter server again
Expectations:
After 5: Flying machines continue their movement.
Plugin and Datapack List
Paper version
[13:51:19 INFO]: fThis server is running Paper version git-Paper-538 (MC: 1.19.4) (Implementing API version 1.19.4-R0.1-SNAPSHOT) (Git: bcd8dc2)r
aYou are running the latest versionr
7oPrevious version: git-Paper-530 (MC: 1.19.4)
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
Start with the Paper 1.19.4 server and reproducible world mentioned in the issue, following the five listed steps around a flying machine activated by noteblocks. Compare the machine state before saving and after restarting; done means flying machines are neither destroyed nor duplicated and continue moving after the world loads.
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
- Needs clarification
- Newbie friendliness
- 35/100