I don’t mean to be a Debby Downer (“Nobody likes a Debby Downer, mmmkay!?”), but is this really a bug or your, understandable, confusion with the workflow?
The mute lights are quite complicated to get the hang of and there are a few threads about the way they ‘work’ already. It would be great if there wasn’t so much blinking IMO, but this is more of a feature request (disabling/ changing mute state visual feedback).
Don’t forget that when you press and hold [FUNC], the trig keys light up in ‘Quick Mute’ mode which is dimmer than (press and hold) [FUNC] + [BANK] = regular ‘Mute Mode’ in which the trig keys are noticeably brighter and the mode remains active until [FUNC] + [BANK] is pressed.
N.B. there are two mute modes - ‘Global’ which is green and ‘Pattern’ which is purple.