I've ran some tests, and this is happening with every one of my coworkers since upgrading to 2024 (also on each service pack)

If we are in an assembly and we edit a part within it, access, edit, or add a sketch to that part, then return back to the top level assembly, this error pops up when attempting to save. If you attempt to close Solidworks, and click "don't save" Solidworks will crash.

When re-opening