FortiAnalyzer shows itself as "down" in device manager

I have added my FortiAnalyzer (7.2.) as a device to itself. In addition, I configured in my FAZ local device log settings, to send local event logs to itself. The connection seems to be working fine, since I receive event logs. Still FortiAnalyzer is shown as "down" under my device manager view.

The following command also shows that, there seems to be a connection established.

diagnose test application oftpd 3

Is that a GUI bug?

Thanks a lot!