Effected Mod Versions: 1.1.2 & 1.1.3 (Potentially more, but these are the ones I've noticed.)

Issue: When walking, all arm animations don't work quite right. This is much easier to notice with Real First Person, which is another mod that renders your entire body in first person, making all of it visible, instead of just your hand (Link at Bottom). No item animations work, including those not effected (Like weapons in vanilla minecraft.)
First Person Model is how I noticed this problem in the first place, as I'm making a modpack for my friends that combines both of these mods. These two mods used to work together (back in 1.16.5) so I'm confused why they no longer work together anymore.

Just note, this isn't the largest issue. The animations in regular first person work just fine. So I feel like this shouldn't take priority over some other (potentially more serious) issues, but I would like this problem fixed eventually.

Ok, so I wasn't sure if you guys would be ok if I put the link to First Person Model in the middle of the report, so I'm saving it to the end. Here's the link to the mod so this issue could be easier to spot (and potentially reproduce as well.)
https://www.curseforge.com/minecraft/mc-mods/first-person-model