Vanilla outposts expanded has a substantial incompatibility, or else it's one of the hundreds of others I'm running screwing things up between the two lol.

Sites will spawn on the same tile from pawns being taken from the outpost.

For whatever reason the time-out never completes. Then, when you're done clearing the site, there's no option to reform a caravan so you're forced to do it manually at the edge of the map so that isn't there to remove them either. This means you have to pack up the whole outpost to get rid of them, they will never despawn.

You also can't send pawns to the outpost except by pausing a caravan that's navigating through the tile rather than directly to it, because the site also takes the place of any other option to navigate to the tile (it's 'Enter <Outpost Name>" instead of the site, and it pops your caravan into the site).