Has compatibility issue with Armored Legacy: https://modrinth.com/resourcepack/armored-legacy/versions
MC 1.21.8 FABRIC

I'm testing a new implementation for 1.21.9+ in which all mods and resource packs should be compatible. If it works correctly, I'll try to backport to previous versions.

Glad to hear it! I was also really happy to see that it was compatible with hold my items.