I'm playing on Xbox X, split screen co-op, no mods, version 1.6 that just came out. Sometimes when I'm in the mines the animation freezes on the first frame. I can't pick up any drops. Since I'm playing couch co-op, player 2 can still kill monsters.
I have the same issue. Xbox, English version 1.6, no mods.
Only Player 1 of split screen co-op experiences this, happens seemingly randomly every few levels of the Mines. Have to leave mine and come back to floor to fix.
Someone in a post about the same bug in the Playstation version posted the following video, captures the issue well: Youtube link