This does not fix the posing issue though. But there's nothing actually different about the rig at all. For some, but not all of the characters, if I delete their rig in the prefab and then put a rig back in the prefab fresh from the project files, their animation issues are mostly solved. The weird thing is that the animation errors at least have an odd fix mostly. Now it suddenly damns the whole project and every character has been affected even if I hadn't touched them in a long time. I was tweaking animation performances in one scene which doesn't even feature most of the characters or anything related to them. But I did nothing that should have caused something like this.

I went back into the commit history to find where it started and it began with my commit. There's no logical reason why such a project-wide problem just suddenly happened. We've been scrambling to figure out why such a problem has occurred and it has been a huge setback. You can see some examples in the images below. With some animation errors as mentioned above. But almost all of them will animate properly on Play Mode. Sometimes it's in a cringing position that models go into when their rigs are broken. You can remove all their animation components and it will still hold that pose instead of a T-Pose. It's like Unity saved their last posed position and has made it their default pose forever. However, the biggest problem is that almost every character model now holds a pose in the Unity editor. Some contorted into random positions for no reason. Some had parts of their rig that started to bend, distort, and move oddly in ways they never did before on animation, most prominently their hands in most cases. Some characters stopped working entirely or partially an example being a character with a long coat but now the coat itself no longer animated at all with the rest of the body. When I say they all broke, it's in various ways. I have no idea why as I only edited a few animations for select characters and their triggers. From there, all characters across the project broke in some way. Then about a month and a half ago I did a bunch of edits related to character animation and performances in a scene and pushed it. This has been how the project's been for the past year. Of course, when we designed them and place them in the world in the Unity Editor, they are in their default T-Pose and animating once the game plays. We had setup many characters across the game.

My team and I are using Unity 2020.3.27f1 LTS. This has been torturing my team for the past month and a half and we're all very lost.

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