Just hit it, or something similar.
Doing an Evil playthrough, and went to camp for the Goblin Celebration.
Ran through diaolog options with Will, Laezal, Astarion, Gale, and Shadowheart.
Went to bed Minthara. Took me 3 tries to not glitch with party "asleep" in beds but no cutscene or progression. The goblin revelers were running about, but couldn't move or switch characters. Couldn't use the "Go to camp" button, or enter turn based mode, or fast forward through the scene. Couldn't save. Tho the options to quit and Load a previous save were available.
3rd or 4th try I figured out what was causing the glitch.
Did the dialog with Minthara.
Went to bed, and selected the option to "sleep" with Minthara. Then, instead of letting things play out, I was hitting the space bar to advance through the "narrator's dialogue" and get on with the cut scene. And that was what was causing it to bug out. Once I reloaded and did all that without trying to fast forward the dialogue/ narrative bits, the scene played out normally.