I have the same problem. For example, I want to add the SSH service in the "home" zone. The window closes immediately. When I open Yast2 firewall again, the service doesn't appear in the list of authorized services. However, the change has been made and is visible via firewall-cmd --list-all-zones. I encounter the same problem with cli and gui. No output is generated. Tumbleweed 20230729.