Google has rolled out Android 12 Beta 4, following on from last month's Beta 3.1. The latest beta contains Google's final Android 12 APIs and 31 SDK, along with over two dozen bug fixes. Beta 4 only adds one feature to Android 12 though, and it is a fairly minor one.
https://www.notebookcheck.net/Android-12-Beta-4-arrives-with-a-new-feature-and-a-slew-of-bug-fixes.554771.0.html