Camera Go Mods (for phones where regular GCam doesn't work:
https://www.celsoazevedo.com/files/android/google-camera/camerago/

⚠️ ONEPLUS and OxygenOS 12 ⚠️

OnePlus is blocking access to the auxiliary cameras (wide, macro, telephoto) on Android 12.

This was working on Android 11 with some package names, but right now nothing works. It's the same limitation as OPPO phones had for a while now.

If you want GCam to work with all sensors, do not upgrade to OOS 12.

You may also want to avoid OnePlus if you plan to use GCam... things are getting worse, not better.

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Update 1:
Other BBK brands are also affected by this. Realme, OPPO, some Vivo, and now OnePlus.

Update 2:
It seems that after some community and media pressure, support was added back to the 9 series after 1 month. No word on support for other devices.