I am not quite sure, what I am missing here.
I did some OH3 widgets. In one I tried to integrate an oh-rollershutter-card component into a f7-card component.
If the card is expandable, the rollershutter card won’t show up.
If I comment the line “expandable: true” the rollershutter card shows up. → “#expandable: true”
I know that the f7 docs say that default slot for cards should be the content slot, but I think there have been other issues with this. Try replacing default with content and see if that gets you what you are expecting: