I actually don't know if anything is blocked, I just noticed the icon showing '2' blocked items.
If I hover over the icon the tooltip comes up and shows what can be seen on the picture.

If I click on the icon I get the list which shows the two trusted entries but no blocked entry.
The whole thing is repeatable, i. e. if I close the tab and re-open it, the problem re-appears.
This is very confusing.