Hello
Thank you for posting in Microsoft Community forum.
It seems that the "Blank Screen" issue on Windows Server 2022 Datacenter is a known problem. There are discussions and documents that mention similar issues, such as users logging into a black screen after reconnecting to a disconnected session and being unable to log off without terminating a specific process.
Server 2022 RDS - Disconnected User reconnect to BlackScreen - Microsoft Q&A
While the exact cause of your issue might vary, it could be related to the server's cumulative updates, features, or configurations. It's recommended to check for any recent updates or patches that might address this issue. Additionally, reviewing the server's event logs for any related errors or warnings could provide more insights into the root cause of the problem.
Best Regards,
Wesley Li