Swamp preventing Caravan

[smittythesmith]

If a swamp is on the edge of the map and the caravan decides to exit the map there it can happen that they never can get everyone within range.

Reproducing this glitch is difficult:  It requires swamp land on the edge of the map and requires that swamp land to be deep in the middle of the departure zone.

Attached is where the problem happened. It was cropped for size.  (Sadly I didn't think to post this till I had the problem jerry-rigged)

to jerry-rig:  in God-mode pave the swamp.