It is indeed. Sometimes they get fixed silently, like that one apparently was at some point, but this one’s still present — encountered it recently, if memory serves.
Possibly…
Not sure about that: done something with a Chi-Ji centred party recently, and this wasn’t happening all the time. Or do you mean that Chi-Ji’s gotta be present in the party for the bug to trigger? I’ve had some suspicions about that, too, but can’t confirm it definitively.
PS A bit off-topic, but still, wanted to ask you something: have you, by chance, got any data about this particular interaction: Mercenaries: cannot be critted vs guaranteed crit ? In PvE, I don’t think I’ve managed to test anything else, other than what’s written down there…