I have a parent note titled “How to avoid getting stuck when writing”, which has 4 children. All 5 of the notes are set to Priority visibility, but the child notes are only visible in one part of the Outline and not in another.
The behavior you’re experiencing is a separate bug (so I’ve moved this into a different topic), not sure why the priority child cards are not being shown. I’ve been able to replicate this on our end and we will push a fix soon.