Layout ID 30 has been inserted and set to priority. As you can see in the screenshot, the 3 overlay layouts are still active. That means, I would have to remove these 3 overlay layouts, so that only the layout with the ID 30 plays.
This should not be an error message, but maybe that’s somehow feasible.
Overlays are completely separate to the scheduled content, and you would expect them to still overlay a priority layout. That’s how it’s intended to work.
You would need to schedule another overlay layout with priority at the same time to override those overlays as well if that’s what you wanted.