The not-set color label (white) doesn’t behave properly in smart filters. For instance, if I set the color to red and then unset it (make it white) Glyphs treats it as if it still has a color label. In the image below, the white glyphs shouldn’t be included in the filter.
Hmm, but can be the glyph color somehow locked? I can not change this half orange part. If I want to use other color it aplies just to the half, and second half stays orange.