Doing Antiquarian quest. Inside the building my companion is locked to a target outside of buildong. I put his behaviour on "Attack: Not Allowed" and he follows me till I put him back on "Attack: Allowed". My companion runs all the way from bottom of building back to same spot at wall and will not move. They appeared to be "locked" to an external target.
More generally, the companion appears to just *completely ignore walls*; there are other bugs that are related, such as https://playnightingale.ideas.aha.io/ideas/FEEDBACK-I-172 ; the problem there isn't the estate, it's "don't shoot through walls".