This situation happened to me, and just in case it helps someone I thought I’d mention that the files are all saved on the disk - just go into settings and look up the location of the temporary save directory. Open that in explorer and you’ll have all the temporary files available.

No, I meant that the "temporary" files themselves got deleted!!

There were different bugs, some deleted session.xml and some the files themselves.

I had actually found the reasons and prepared bug reports, but then had some life messes and lost the reports themselves.

Maybe I'll try to see if I can find the code again (it was plain calls to "deletefile" or something like that ended up being called by an error handler, if I'm not mistaken - it was so reckless code that I moved away from Notepad++)

I've never run in to that issue in the last 10+ years of using notepad++ with these plugins. Since my autosave location is dropbox, it's automatically backed up the moment the file is saved. I've set my control+n to a new note and not an empty file. The take notes plugin doesn't rely on the built in temp auto saves.

If a file is saved and then gets corrupted for whatever reason, I can also use dropbox to grab the previous known good version. I've tested it, but I've never had to actually use it.