Kudos to Crapshoot again!!
He spotted the problem and found a workaround in record time. Apparently, the problem is a bug in the bot pathfinding code. After taking the documents, the bot ignored the path nodes that had led him into the dugout and seemed to fixate on a node outside. It was the node that points to the gun dynamite action. Crapshoot noticed that when the bot finally got out, he headed for that node before getting on the correct path back to the delivery point. The workaround was to simply move the node a little so the bot had a straight shot at it from the doorway. Crapshoot also simplified the pathing inside the close quarters of the dugout.
So it looks like we've dug out a small bug in the dugout!
(sorry)