It looks like the taskbar overflow feature from the Dev Channel is also in the latest build 22622.436 of the Beta Channel. If you want to turn it on, you can do so by following the steps below.
How to Turn on Taskbar Overflow in Windows 11 22H2 Beta
Click here to get vivetool from GitHub.
Unzip vivetool.zip on your Desktop. Right-click the vivetool folder and choose PowerShell from the context menu. PowerShell will open as an administrator and with the right path.
Type.vivetool /enable /id:35620393 or copy and paste it.
Enter.vivetool /enable /id:35620394 or copy and paste it.
Hit enter Restart OS or Restart Explorer (changes will take place)