Pathing-Issue: Nobles couldnt find way on slope/wall edge
Nobles pathed to a corner of the castle that is not (yet) fully blocked instead of going through door/base (way longer though), couldnt path arround edge then. Giving a manual move command worked (2nd screenshot, save after that). Maybe the guest blocked them there?
And yupp they stuck again, even liza (the bottom right yellow path in pic above) wanted to take the scenic route and not the door, used her to lock it then
Edit: At least the raiders could take the edge though :D