I don't know how exactly the monochrome colorized Android/GrapheneOS icons work but currently two apps I have installed have them borked in different ways. Phandroid by @thoralf and Loops by @dansup both do different things that are somehow off from what is expected. The @phanpy logo (on the Android build) doesn't seem to support the feature at all and the Loops logo (by @nclm) is weirdly miscolored.