NUT plugin on 21.7.8: Diagnostic GUI page is empty but plugin is working fine

[hgkdd]

Hey all.

I have a strange problem with the nut plugin on my opnsense running 21.7.8:

My UPS ist connected to my opnsense via USB. NUT plugin configured as "standalone". I get UPS info on cli using the upsc command. Shutdown is working also. Secondary servers can also connect to the NUT-server on the opnsense (MODE=netclient). So erverything seems to work perfectly fine.

Surprinsingly, the Diagnostic page of the plugin is completely empty (yes, I already reset opnsense). Even more surprisingly: if I connect the UPS to another server an configure opnsense in netclient mode the Diagnostic page shows correct content.

Any idea what's going on here? Any commands to run to get more insight?

Thanks!
Hans