I posted this on Steam, but I will copy the text body again here for thoroughness.
I got to a VIP mission, and the game crashed the moment I moved one of my soldiers. I restarted with cheats enabled and found a few things: first, only movement is affected, and the units can still rotate, shoot, heal, etc; second, the movement and actions of NPCs are unaffected; and third, the VIP did not spawn. I found that even when I loaded "before mission" to restart the whole map, I got the same results.
Edit: aborting the mission also crashes the game.
(I hope I've uploaded the correct files; please let me know if I got anything wrong).
auto_groundcombat_turn_1_start-36.json output.log.1