Google launched the Android 13 Beta 3 version two days ago, but the latest version of Beta 3.1 was launched.
This minor update to Android 13 Beta 3 fixes an issue where the Android beta feedback app was not available on Android 13 in some cases.
The user found that the inside lacks the Beta Feedback APP.Of course, this Feedback App has no big relationship for daily use of telephone devices, but if the Beta test version is not available, the user cannot return the problem, then the BETA test version becomes boring.
So Google also launched the Beta 3.1 version immediately, and returned to the Beta Feedback App.Beta 3.1 (Build Number: TPB3.220513.017.B1) is also pushed to users through OTA.
Source: Android Developers