This isn't necessarily a bug, but unfortunately the mod and resource pack are incompatible; if you have Fresh Animations on, the cats' heads will not move to the music when it is played in a jukebox.

just to give this a boost, i will pop in to say that I use Entity Model Features on Fabric and just recently added Fresh Animations and was so sad when I noticed that my Cats could no longer jam along! 😅

That is unfortunate :( I'm not sure if this is possible to fix due to Optifine using Custom Entity Models, but I will try and look into it!

Also tacking on this, I use the new Entity Model Features mod to use fresh animations as an alternative to optifine and it is open source, so if that helps with patching functionality optifine's full functionality has already been recreated as fabric mods.

Will be amazing if the two greatest Minecraft animation add-ons could be compatible together!

Just had to check in here because I found the same issue. Would love to get a fix on this, but then I assume it will take a bit of work to do this. Touché

i personally havent noticed this issue on 1.21.1