Ladder teleport bug

If you drag someone and use a ladder, and they go down the ladder first, the dragee will be teleported back to the ladder when the dragger finishes

Reproduce the drag-and-ladder sequence described in the issue, with the dragged player descending before the dragger. Trace the ladder and dragging behavior to identify where the dragee is moved back, then verify that the dragee remains at its destination when the dragger finishes.

Written by the indexing model from the issue text.