A4mkii inconsistent perf mute toggle?

An annoyance that I think is a bug, wondering if anyone else sees it:
The performance mode track mute/unmute buttons (trigs 1-6) are inconsistent when trying to hit more than one.

The buttons seem to work totally fine, but if I try hitting two or more simultaneously, it’s inconsistent, dropping presses seemingly randomly. I’ve tried variations (different combinations of tracks, “rolling” the buttons in different directions for different timing) but I can’t find any pattern to it.

It’s not like a ghosting/rollover thing; iirc they all work properly if you slowly press them. Just seems to not handle simultaneous presses right.