Zombie Villager Profession Changes

Expected behavior

The Zombie Villager should not change jobs randomly.

Observed/Actual behavior

I went to an Igloo, and put the Zombie Villager (Cleric) inside of a boat, I then went away from the chunk for roughly 8-10 minutes or so, I came back and the Zombie Villager was no longer a Cleric, but was now a Librarian.

I tested and recreated the issue myself, and confirmed that this will indeed happen.

Before:

After:

Steps/models to reproduce

1. Find Igloo
2. Put Zombie Villager inside of a boat
3. Move away from the chunk and wait (I assume the issue is relating to the chunk unloading and reloading?)
4. Come back after roughly 15 minutes or so.
5. Zombie Villager profession may have changed (The player on my server who originally reported this issue said it wasn't consistent at times, but I do believe it is related to the chunk as mentioned before.)

Plugin and Datapack List

No Plugins, and no Datapacks.

Paper version

This server is running Paper version 1.21.11-75-main@a47cb98 (2026-01-04T14:53:35Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.11-74-3ebc5b3 (MC: 1.21.11)

Other

No response

No source files, tests, or entry points are named in the issue. First reproduce the profession change using the listed Igloo, boat, and chunk-unloading steps; done means the Zombie Villager retains its profession after leaving and re-entering the chunk.