One scene using a movie projector showed a green screen for the entirety of the video (not critical to the story: it shows a well and can be found on YouTube). Occasional missing textures: removing vsync seems to help and/or reducing graphics quality.

Sometimes frequent (<30 mins), sometimes not (multiple hours). There was a consistent crash in an elevator under Proton 8.0-2 that I worked around by switching to Proton 7.0-6.