I just made my first trip to space and back with my astronaut and she was fine for a cycle or two. As soon as I sent her to analyze the data banks, she vanished, no death notification, nothing. She was gone from all lists including jobs and I couldn't find her at all. I reloaded to a previous save and found her and thought maybe I would avoid this bug, nope, she disappeared before the cycle finished.
Trying to analyze data banks.