It's just been in this specific beta version, and most people don't watch their scouts as their scouts do their business, so I'm actually surprised it was caught this fast! That's fixed for the next version, but until that comes out tomorrow I suggest only using mark II scouts and above to avoid what you're seeing in those saves -- that's definitely the cause of that aggression. I'd put the release out tonight, but I'm in the middle of some other stuff that isn't quite baked yet, and before I finish that I need to go crash...