Before Continuing:

• Check you are using the latest version of the mods and its dependencies
• Always include a latest.log if you are crashing
• Remove mod that enhances Minecraft: Optifine, Sodium, others. The issue persists.
• If you are unsure which mod is the culprit.
  Disable all of your mods and enable them 1-2 mods each time to isolate the culprit
• Confirm that there is no existing issue with a similar description submitted in the list of issues.

Version

1.20.1-FORGE

Supplementaries Version

supplementaries-1.20-2.8.17

Moonlight Lib Version

moonlight-1.20-2.12.14-forge

Issue Detail

The tamed zombie horse turns untamed after player reloads the world.
Like this:https://krseoul.imgtbl.com/i/2024/08/21/66c56e447e327.gif