As far as I remember it was the same for me and I need to change semantic class to blinds to see it on the card. I did not understand why, because from description point of view OpenState is correct.
So in the end I got an equipment inside another equipment although it is semantically incorrect since it is a channel inside the physical actuator. (brr)
The blinds do indeed show up in the card as a glance.
Mmmh ok seems to be quite buggy at the moment and I wouldn’t use it this way in production since it doesn’t make any sense.
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It still doesn’t work correctly since the glance should show the number of OPEN blinds. But in my case only the CLOSED blinds do show up. I would expect this is the case because the state delivered by KNX is 0 -> 100 from completely open (0) to completely closed (100). BUT and this is funny and shows the buggy state of the interface the blinds icon does correctly show the opening and closing of the blinds.