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?
The Trunk Cups.Save 48.octsav.gz
Yea, but they ignored the door to begin with, i had to manually bing someone there to lock it. They all went to that edge (all that were outside).
Here if you want to investigate, attack incoming and i enlisted and sent them all on that tower. Right before the door is a noble that wants to run through that edge as well lol. Savegame is at moment of the screenshot.
The Trunk Cups.Save 55.octsav.gz
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
Interesting, thanks!