The title pretty much says everything that needs to be said.
I played a Multiplayer 2v2 Coop game on the map Hideout as Japanese with Jean d’Arc against Delhi, Chinese.
Shortly before finishing the game I noticed the caravan trader from the castle crow spawned right in the center of the Hideout forest, thus could not reach the castle at all (and made it quite bothersome chopping from free).
I hadn’t set a market for the castle, as I forgot doing so. Afterwards the traders spawned normally on the set neutral market.