Been running stable branch and ever since 1.40 was released, on some mission starts (in the editor at least) units seem to start in combat mode. That means they're lying down on start, break ambient animations and patrols tend to leave their pattern and run around screaming, not to mention vehicles speeding off road like hell. Within the first few seconds of a mission they'll calm down again and most (not all) units are going back to normal. Patrols are still not returning to their safe walk, instead they continue their patrols with weapons at the ready. I first observed this in a mission with lots of AI but without any enemy on the map.
It also seems to rely on the number of AI and objects around. I wasn't able to reproduce this issue in the VR environment but it happened to me every time in the attached repro mission on Stratis.