the open scene has been modified externally, CANT SAVE SCENE

So after i play my game at least once, this appears:
171079-screenshot-2020-11-15-215127.png

After that, when i want to save the scene, this message pops up:
171080-a.png

Pressing “Reload” will restart the scene, but without the changes i made in it.
Editing scripts and other things works.
Please help, i am really desperate right now

Hi, I have a similar situation. Did you find a solution? Unity 2019.3.6f1