Doesn’t happen very often but I just witnessed it as clear as it could get.
I went into my script, commented out 3 lines. Went to another script, commented out a few more lines.
Then I went back to my first script and found the edit i just did was gone. Nothing was commented out.
Luckily I didn’t loose any real work, but it’s clear that this is an issue that exist.
No repro available.