Peculiar and dangerous mishandling of open files in Photoshop 21

Ok. This will be hard to explain. But it happened before, and it happened in older and newer versions. 

I had two different files opened. I was just working on one checking if everything is okay so I can save them. Then I realized, both files are suddenly the same. And they werent just a second before. I wasn't saving them. Wasn't duplicating them. Didn't mess with anything except one smart object that was open too which I closed.

Now I wasn't sure what to do but I didn't want to lose the work. Hoping it's just some screen drivere issue (which happened before) I closed and saved. And got two same files. One was replaced with other while it was being open and I have no clue how. There is no shortcut that could do that. There is no action that could do that.

There was nothing in recovery folder, no even smart objects in temp folder. And there should be tons of smart objects.

Windows 11 Pro, Photoshop 21 (the one with two flamingos)

Similar thing happened before but I wasn't saving files and would just close Photoshop when it start behaving weird like image not updating,  layers become weird and behaving glitchy.