This only happens to me when I use Legendary or Unique tributes. It works fine with Magic or Rare ones. It’s happened in both T1 and T2 though I suspect it’ll happen in T3 if I’m crazy enough to try. (HC only, crashes are extra ‘fun’)
Load the tribute, start the map, blast my way thru everything, when I try entering the final area my mercenary is standing there. “Hi, Raheir! I’m trying to join you!” But the game just sits there spinning its wheels. I never arrive on the map and have to shut down the game with Task Manager.
So I’ve lost 2 legendary and 1 unique item tribute but not my toons. So, yeah? Obviously something is borked.