I kept noticing the BTR-80 having an issue where it would suddenly stop driving, but instead kind of shimmy along, moving it's steerable wheels back and forth. Example video...
https://www.twitch.tv/videos/864324791
I then noticed on closer inspection, that the tires are not connecting with the ground when this behavior occurs...
Shortly after this screenshot was taken, the AI shimmied forward enough that it bumped into the tree in front of it. When it bumped the tree, the BTR's tires momentarily touched the ground again and it began to drive normal for a moment.