These are stable Google Camera versions compatible with the OnePlus 7 family of devices as suggested on the telegram group for this phone. Thanks to Sir Tavares, Marian, Hooolm, and all others involved in testing and finding good settings.
Urnyx05 (GCam 7.2, Android 9+) »
Version from Urnyx05 based on GCam 7.2 and compatible with Android 9 and 10:
After installing the apk above, download the config for this phone and load it into GCam:
Some or all versions from the following modders are known to work on these devices:
Visit their pages if you’re looking for the latest update.