There were big changes in 1.21.2 to entities and models, many packs will need to be updated,
check if your issue is mentioned here before posting
https://github.com/Traben-0/Entity_Model_Features/blob/master/.github/1.21.2%2B%20%20changes.md
If it is mentioned there go and report to the resourcepack maker instead
Common issues are:
- broken baby model animations
- broken humanoid 'headwear' animations
- broken 2nd layers in player animation packs.
- armor textures being broken
There were big changes in 1.21.2 to entities and models, many packs will need to be updated,
check if your issue is mentioned here before posting
https://github.com/Traben-0/Entity_Model_Features/blob/master/.github/1.21.2%2B%20%20changes.md
If it is mentioned there go and report to the resourcepack maker instead
Common issues are: