Have some lost Stahlmarkians wandering around the map. I think they might have been part of a trader caravan that got attacked (it happened alot). Later saves don't have this happen, and they seem to have all left/died.
This one was fun; dug out lots of good stuff in the trade logic and found some neat cases that needed to be covered, largely to do with traders losing all their goods due to combat interruptions thus thinking they couldn't complete their mission. This will be cleaned up for the next patch.
Ah, so its related to the random stacks of half a dozen commodities on a single tile in the wilderness too. There's probably one in the save, but where....? Probably surrounded by willows *shakes fist* I thought they were related, but wasn't sure why they were all on a single tile. They're also automatically claimed by the colony, which can cause problems with job orders and item counts due to distance.