finished the campaign now. and want to name one bug that happend multiple times(10-15times) too me.
if i finish a bossfight (even mini bosses), the loot dropped could not be picked up.
I notice that you can over the inventory but cannot interacti with it (move items) or distribute level up points.

after you go to another location (by traveling or just proceed where the quest takes you) it fixes the issue.
But it happend to me so many times that i believe that other players must have this issue aswell.

Good luck solvin :) like the beta there is still protential