I have an other strange behavior:
The player count is now not displayed, ther dedicated server always shows 0 players.
I think its because I had to disable
[PacketHandlerComponents]
+Components=OnlineSubsystemSteam.SteamAuthComponentModuleInterface
I also have my own steam AppID
I think I have to role back to the older engine version 4.26.3
Because I have no idea how to fix this.