Not sure if this is a bug, but you can enter first-person flight with the Cave Angels if you open the map now.
/r/DeepRockGalactic: Deep Rock Galactic - Deep Rock Galactic is a 1-4 player co-op-first sci-fi FPS featuring badass space Dwarves, 100% destructible environments, procedurally-generated caves, and endless hordes of alien monsters. Now fully released! - May 2, 2022 - 16:07