OnePlus has just announced its latest software update for its 2021 flagship 9 and 9 Pro smartphones. It is based on Android 12, just like the last; however, it is apparent from the off that it fixes a lot of problems resulting from the initial upgrade to this latest OS version. It also enhances some signature features of the brand, Canvas AOD included.
https://www.notebookcheck.net/OnePlus-releases-a-lengthy-changelog-with-its-latest-9-and-9-Pro-software-update.595065.0.html