Slot as Canvas Slot returns None on a 100% Canvas Slot

Hey! I’m trying to change the Offsets of a BorderPanel on my Widget.
The Widget is hella simple. Canvas → Canvas → Border. And I added the UserObjectListEntry Interface, so I can use it in a ListView.

grafik

And I have this function on it, so I can make the changes:

A blueprint actor is creating the widget that holds the list, creates a bunch of these items, adds them to a list. and then On Tick all the items shall be changed.

But Slot as Canvas Slot keeps returning None, all the way.

I’ve did this in VERY similar way, without any problems. Why doesn’t it work here? Is it because the BorderPanel is part of a ListItem?