Modded JEM Leg UV missing/broken

[dusk pike]

Hi, im trying to make a small compat pack to use Creepermax's Beefier Bovine model for the moobloom from the Friends & Foes mod (https://modrinth.com/mod/friends-and-foes).
Somehow, regardless of what i try, the texture for the legs never shows up. See screenshot, left is a moobloom, right is a vanilla cow. Here, both models use the exact same JEM and texture files (ignore the flowers on the back, those are not part of the model). I also tried moving the UV around to no avail.
I was able to reproduce this in both 1.19.2 and 1.20.1, with no other mods installed. There is nothing unusual in the logs, EMF correctly finds and applies the JEM. Any new cube added in Blockbench does NOT show up ingame if its in the legs group. I can provide the rpack here, though its not meant to be distributed (working on it for a private modpack).
PS: Awesome work on the new update, this is the only thing i had issues with so far.

[crisp vault]

Igot it working. You need to give the name of the blocks like Friends and foes model.

[crisp vault]

Dunno if the message I wrote while waking up made sense 😅
In the model from creeper max, you need to rename the legs this way.
If this model go animation, you'll need to replace in the code too

[dusk pike]

Amazing, solved!
Thank you, i was slowly loosing my sanity over this. The name of the cubes did not cross my mind. Have a nice day!

[hollow raven]

OptiFine randomly has different names for model parts than vanilla for the vanilla mobs

So cows have leg1-4 when really the vanilla cows use those names you showed above

So for vanilla mobs I have to apply the optifine part names for it to work