As the AOSP ROM is in beta stage, bugs are highly likely. The Android 5.1 Lollipop CyanogenMod 12.1 beta ROM works with Galaxy S3 I9300. Flashing this on any incorrect variant might brick the device.

While we await Android 12L for the Pixel 6 and 6 Pro, the ProtonAOSP custom ROM has managed to beat Google to the punch with version 12.3.0.