Same happened to my GOS (on Pixel 8). Primary profile has just compatibility layer, while my secondary profile has Google Play, Store etc.
What seemed to happen is that my secondary profile auto updated gcam to v10, while my main profile still had v9 and it stopped working (just crashed immediately).
Aurora was complaining about, not being able to downgrade my app, because it was seeing the gcam installed on my secondary profile. This seems to be related to the v9 -> v10 update.
Anyway, uninstalled gcam from secondary profile and then manually installed/downloaded version 68469120 via Aurora.