As if the choices for Raspberry Pi OS with GoPiGo3 were not currently in motion, the Raspberry Pi folks have attempted to make things better by publishing a “Legacy PiOS” based on Buster, and also fixing the “picamera missing on bullseye” issue by issuing a “Legacy PiCamera For Bullseye” package.
I believe at this moment the “Official OS for GoPiGo3” is GoPiGo3 OS v3.0.1.
My biggest issue with this OS is that it does not allow headless network pre-configuration,
Further @Jimrh reported that users should not attempt to update the OS
Update: I tested the “Install GoPiGo3 Software over the just announced Legacy Buster based PiOS” path - Success. See reply.