The team is aware of a rare issue where players might get stuck on the final level "The Command Deck." There is a point where players who get killed during the chapter might fall through the floor while being revived by Elizabeth. When this happens, actions like shooting and moving may no longer be accessible.
Choosing to "Restart Checkpoint" may resolve this issue, but if it does not (as a checkpoint may have saved automatically after falling through the floor), the best way to work around this issue would be to load The Command Deck chapter from the beginning.