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

1.21.1-NEOFORGE

Supplementaries Version

3.1.8

Moonlight Lib Version

2.18.13

Describe Issue

The Soap Block has the c:storage_blocks/flint item tag instead of the Flint Block.
The tag should be removed from the Soap Block and added to the Flint Block instead.