Very Bizarre Clone Stamp Behavior / Bug
Context: I was experimenting with random stuff to try and find a technique for getting a better hair selection. I used the Quick Selection and Refine Mask for a smooth outline of me in the main layer (conveniently named "6I7A2391 copy 4"), and then used the color range tool to make a separate mask layer, then I was going to try and combine them somehow. So in the video below you see a white layer I made by converting the aformentioned color-range mask into a raster layer, which I figured I'd try to copy into the other layer's mask with the clone stamp tool (using "current and below" sample mode).
Bug / Behavior: Better to just see the video. The clone stamp tool starts cloning from, well I have no idea where lol. Expected behavior was copy the raster pixels from the below layer into the mask of the currently selected layer (with mask viewing mode enabled, or whatever it's called).

