That’s not a group tag. That’s merely a group located in the Tags group of a database. It is only a container and not applied as a tag to anything.
These are group tags, one with a custom color applied…
PS: I had just woken up and I think I misread your comment. But the fact still stands: groups do not have a color property. Your use of a group in the Tags group is an exception and I don’t know if it’s intentional. It looks like it just retained the color applied when it was a tag.
In fact, I just saw this is possible but @cgrunenberg would have to comment on it.…