It uses a considerable amount of object phasing on triggers, including an entirely constructed deck with ceiling, walls, and floors on a ground map..
Some users are having NPC enemies spawn in odd places or outside the constructed deck and having BOs get shunted outside the constructed deck.
I am completely unable to replicate this. Most people seem to have no issues but some people are having awful issues with enemies spawning outside of the placed walls or turning up 50 meters away from where they are supposed to be after the constructed walls disappear.
Are Foundry missions generated clientside? Is NPC pathing handled clientside? I can't manage to replicate the issues.