How does deck determine which cards without due dates show up on "Upcoming Cards"?

Title says it all. In the new “Upcoming Cards” overview (super nice feature btw) there is a list for cards without a due date (no due). For me, it only shows some, not all, of my cards without dates. How does deck determine what goes into that “No Due” list?

It does not work for me as well.
I created card with no due date ant it is not on the “No due” list.

Nextcloud 19.0.3
Deck 1.1.0

I eventually figured it out. As far as I can tell, when the card is assigned to the user without a date, it’ll end up in the “Upcoming cards” list…