SUMMARY
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STEPS TO REPRODUCE
1. From time to time some parts of the screen would go black, but only some areas and at first seemed to be at random, sometimes covering over the entire canvas. I still don't know what triggers it, but happens with certain frequency. Sometimes I'm making a brush stroke and while I'm doing it, some black squares will appear in the path of my stroke instead of me seeing the actual brush stroke, and once I lift the brush from the tablet the blackness appears again, sometimes I'll just leave for a bit and when I return the blackness is already there.
At first I didn't know what it was, toggling visibility from the layers didn't make it go away, but mirroring the image, did. But then I tried to find another way so I could try to eliminate the possibilities of what could be causing it, and making the reference images invisible worked, so I noticed that the times where the black area covered the whole canvas I had Reference Images on both sides of the canvas and that there was still some parts not black on the permanent gray area around the canvas, so it makes me think that the black area encompasses the entirety of the reference images.

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION