Yeah, checked it out after posting, its targeting priority umm issue?
With regular ATGs, its the crew that is being targeted, not the gun.
Reverse seems to be the case for pak43.
nope, this happens with any support weapons, test yourself, get a sniper and shoot at a MG using the tacmap, the sniper will shoot at the mg and won't kill anyone, this is a bug and relic probably knew about this, this is why support weapons are invincible when they are crewed because if they weren't you could just snipe anything using tanks or ATGs.
you can still do that but the gun will have 0.1% health when it get decrewed. I guess relic never bothered fixing since it requires a little bit of micro to pull it off.