Google notes that the Android 12 beta 2.1 update got rid of flickering or jittery animations when using gesture navigation to access recent apps. An issue that caused the camera and microphone permission indicators to get stuck and disappear (until the phone was rebooted) was fixed by the update. Also eliminated by Android 12 beta 2.1 was an issue that some users experienced that froze their phone on the Setup Wizard after installing the second beta and resetting the handset.
Lastly, the update also fixed an issue that prevented an Android Virtual Device (AVD) running Android 12 and using the Android Emulator from connecting to the internet. If you’re able to receive Android 12 beta 2.1 OTA, you can go to Settings > System > Advanced > System update to download and install it.