When in a mission where a thief appears and the win condition is "kill all enemies" the thief counts towards the win condition. If you grab the contents of the chest the thief is after without killing the thief, then the thief doesn't know what to do and just stands still. This delays victory until the thief is killed.
On the bandit fortress outer wall mission if you press the Z key right away then the engineer moves back with the others as if she already moved that turn. Not a big bug and one that can be easily be undone by restarting the mission, but I thought I should report this.
Thanks for the report!