Blockbench leg model does not render

Hi,

since I updated my mod from NeoForge 1.21.1 to 1.21.8 in Mcreator 2025.3, the right leg disappeared in my armor set ingame.
All the other parts (including the left leg) are perfectly fine and nothing seems bugged but this one singular leg just won't render at all.
I've checked the pivot points in Blockbench which seem fine (1.9 12 0 for the right leg / -1.9 12 0 for the left leg). In the previous mc version everything rendered as it should.
I reuploaded my java model and regenerated the code (as well as the whole gradle folder bc why not) but these quick fixes do not work for me.
There are two questions which remain: What changed in the update and how can I fix it? (AI is clueless too)
Thx in advance :D