Tested with other players last night and found that dragging a critter through the entrance of a burrow causes some interesting bugs, especially when done multiple times in succession.

Reproduction:

1. Drag a critter through a burrow entrance normally.

2. Upon transition, the dragged critter seems to be weightless and can be dragged at normal walking speed.

3. Without ending the dragging action, drag the critter back through the burrow entrance.

4. Player movement becomes erratic, only able to move in single tiles of a seemingly random direction.