How to run OpenBrush in Passthrough on Quest?

OpenBrush works fine except I wanted to run the app in mixed reality mode or XR or passthrough (whatever it's called). I've seen the youtube videos and I'm like "yeah I want to do that".

I'm running OpenBrush Quest sku, version 1.0.206, installed from AppLab, on a Quest Pro headset. I'm running the app fully from the headset, untethered, not through steam no link cable etc.

I have passthrough enabled on my headset and it's my default environment whenever I'm not in an app. So I expect the issue is not related to device settings.
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