@zia_kayani that’s pretty unusual, to the point that I don’t really have any idea what might be going on. In order to speculate, we’d really need a Minimal, Reproducible Example.
Good catch, that’s probably it. If things ever worked with capitalized versions it was purely unintentional, we’ve 100% only ever demonstrated use of lower-case color names in all docs and examples. I am surprised this would not emit a loud warning about a missing column name, though.