When I switch my resolution to "windowed", and later back to "full screen", now my framerate is capped at 50 (according to the number in the topleft of my screen). It's not even blinking, it's just deadfrozen 50. In the settings I see it's still set to 60 though. Trying to alter it manually doesn't do anything.
If I unlock the cap in this situation it's behaving as if I capped it 60 (blinking around 60fps).