layer Blending modes : hue, saturation, color, luminosity visual bug

layer blending modes : hue, saturation, color, luminosity, can't be used because of a visual bug. see below.

I have experienced this also. Those blending modes give some funky results. I'm guessing it has something to do with how the individual painting pixels behave with the blending modes because there is some much variation in a paint stroke, which makes in unuseable.

Oh, that's a VERY old bug. Thought it has long been fixed... obviously not!

There's a (kind of) workaround: put a multiply layer, filled with white at the bottom of the layer stack. The downside is, that 'Paint Texture' in visual settings now affects paper texture too... But the blending now works properly - so pick your poison.