So I built this really cute little den for my pangolins by digging a trench then overlaying with rocks. It took a little fiddling with but I got it to count as shelter. However every time they go down into it the game says the escaped. I even moved it smack in the middle of the habitat thinking too close to the wall. Nope. I ended up digging a very shallow trench and building it up with the rocks before covering it and so far this works. I'm sad because I wanted to dig down not just put a cave on top of the ground. Anyone know how to prevent this?