Device Diagnostics no details

I opened several clients that show the tags and that does not show anything either.
In below screenshot, I have a web client opened on the right showing some indicators from PLC, and the Device page on the left, and the numbers are still 0.

I can’t understand why I cannot see any detailed diagnostic statistics on my Device Diagnostics page. Is it supposed to look like that?

The tags are “polled” rather than “subscribed”, does that make a difference?
(UascClientMessageHandler Warning there was a vague mention here that using polls does not help device diagnostics.)