The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Ah! I didn't realize that. Thanks for the response!
In the same replay, the Notha's attacked ground units, completely on their own, without any orders, so I was expecting the same here. They weren't on a Patrol order at that time, so obviously Patrol works differently. They act as Fighters-only when on Patrol.