Reply To: Blender 3.0 messed up my animation progress (PROXIES & LIBRARY OVERRIDE ISSUE)

Glad you got it working.

Here’s an explanation on Blend 1s.

https://blog.cgcookie.com/what-is-a-blend1-file-and-do-you-really-need-them/

In your case it sounded like it saved your butt.  But in my case I’ve turned them off nearly a decade ago.