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!
No game end/score vs AI
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Against Sorian AI I cannot finish the game having destroyed everything. It seems some units or buildings are not registered as destroyed.
See game end upper left: https://replay.faforever.com/18445063
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Victory condition is set to annihilation, best to set it to at least supremacy if you want a game that finishes reasonably