"Assault Expert won’t unlock after finishing Tier 1 — Q-Link 6 still locked"

I’ve fully completed the first Assault class challenge (10,000/10,000 score + 3/3 Adrenaline Injector kills) and it shows a green checkmark, but Assault Expert will not unlock and I can’t access Q-Link 6. I’ve restarted, switched specialists, played multiple matches as Assault, and tried extra score/kills, but progression won’t update.

Has anyone found a confirmed fix, or can a dev advise if this is a known progression bug?