Big Sur Beta 7 AD broken?

I got the famous "Network Accounts Are Unavailable" error since Beta 7 and can no longer login to my account. A rejoin did not help.

Any workarounds?
We have the same issue with Beta 7 and still with Beta 8.

System Preferences -> User & Groups -> Login options -> Network Account Server show a green light. But on login screen we see "Network Accounts Are Unavailable"
I can't even Browse the Users list with the "Directory Utility". I receive a error code "2100". Pre Beta 7 everything was fine.
Problem still exists in Beta 9
Macbook pro 13' 2017. - the same problem.
Also Admin account lost his privileges.
Big Sur Beta 7 AD broken?
 
 
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