I have some general solutions that helped me 90% of time.
Might be a long shot because I haven’t encountered same problem but quite similar. Here are few tips that sometimes might help and helped me many times:
- Try different storage drive if you can, UE sometimes doesn’t like either custom characters outside basic ASCII or is unable to obtain sufficient privileges to update data.
- Remove Saved and Intermediate (fair warning though, back it up before removing, it contains some editor settings, colors of folders etc. not essential to your project but might to you)
- Migrate if you can your project to blank and package/work from there, I know this is not the best solution but as last resort is better than nothing.
I hope at least some of this helps.