Reproduction scenario: - Select brush mode: normal, brush type: any. - Pick a hue (say red), and pick a color with zero saturation (leftmost). Select the color at decent brightness (at the top). - Create a stroke with this color. - Pick a new hue that is not blue, (say green) and a color with some saturation and brightness. - Select brush mode: colorize, colorize mode: Saturation. - Colorize the stroke.
Expected: - The saturation of the new color is applied to the existing stroke, keeping brightness and hue untouched.
Result: - The saturation is applied but the hue becomes blue.
Notes: - Any non-zero saturation on the first stroke fixes the problem and the original hue is respected. - The problem also exists with the colorize mode "Color", which applies both hue and saturation to the target stroke leaving brightness untouched.