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!
Bug: unsolicited surround mex with fabs
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To replicate: right-click with your T2+ engi on a structure under construction, then quickly SHIFT-right-click on a T3 mex, and fabs around that mex will be ordered, even though you are supposed to SHIFT-double-right-click on a T3 mex to surround it with fabs.
I would provide a replay, but I doubt there is a way to see if I double-clicked