[MCM-1573] Entities are moved from their point of origin to random locations.

Partner Rank:

Partner Team Reporting:

Jigarbov Productions

Verification builds:

1.19.10.03 , 1.19.20.23

Summary:

Entities are moved from their point of origin to random locations.

Impact:

Entities being moved from where they're supposed to exist in the world can cause a lot of problems for all maps, but obviously can result in them being incompletable which is the worst. currently blocking a release, but if it affects other content on the store it could be way worse than we think.

Repro Steps:

Open LoM world sent to greggo
run around for a bit
go back to previous npcs

Expected:

the entities should remain in the location they were put in unless i moved them or the player moved them

Observed:

The entities move to seemingly random positions on chunk reload

Screenshots/Videos attached:

screenshots above

Regression Builds:

1.19.0

Notes:

so far only been able to repro on the map i sent to you. I developed the whole map in 1.19.0 and the bug repros in 1.19.10 and 1.19.20 but never happened during development.

seems like a regression of: https://bugs.mojang.com/browse/MCM-1514