It's pretty easy to invert the normal and cinematic camera movements, such that the HUD incorrectly remains visible during cinematic movement and vice versa.
Steps to reproduce:
- Bind a key to "Toggle Cinematic Camera"
- Press that key and pause at the same time
---> The UI visibility has toggled, but the camera type has not.
The problem stays even if you save and exit a world, but can be fixed by quitting the game.