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!
It sounds like similar behavior to this:
https://github.com/FAForever/fa/issues/3278
This is something done by the engine. I suspect it has to do with not retargeting something it can't reach. Not sure how / when it resets and if we can reset it ourselves.
