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With Alpha 21.1 I see a very small window briefly pop-up with with the mangohud UI and a background for 7d2d, then that closes and I get full screen game but no mangohud.
The game otherwise plays just fine, I just miss the stats.
Using --dlsym makes no difference and like I said, it shows in the first window and disappears with full-screen. I've tried with both windowed and full-screen mode.
Interestingly the Steam overlay FPS counter is not present either. I'm baffled.