From 4.19 to 4.21 - incompatible_unique_net_id

I’m on 4.22 an i have an issue with players on steam connection to a non steam dedicated server.
I figured out that subsystems now need to be the same and removed that check like described here.

I now have a problem that the server crashes as a player joins. It’s probably about the problems converting between FUniqueNetId types, but I’m not sure.

Can anyone help me with that?

I attached the end of my Server log file with the crash.

Thanks in advance.