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-1.20-2.8.11

Moonlight Lib Version

moonlight-1.20-2.11.22-forge

Issue Detail

When putting a banner pattern from other mods (e.g Runelic) on a flag, the flags get the purple-black missing texture