My hand was on the left side of the keyboard pressing random keys, maybe my right hand touched the first row of the right, but nowhere near PrtScr. Suddenly my GNOME made a screenshot. How could this happen? I don’t remember remapping anything in that regard, must be some default behavior.
Is Meta + Shift + S an alternative shortcut for taking screenshots in GNOME?
I have a USB keyboard that has Fn + U conveniently
My 65% keyboard has FN + p for print screen
You can check (and change if needed) the existing keyboard shortcuts for taking screenshots, in Settings->Keyboard->View and Customize Shortcuts->Screenshots.