If you create a sample using the twin stick top down sample. And then start playing the demo. If you move to let’s say, the upper right hand corner, and then move 45 degrees up and into the corner. The ship will work it’s way through the blocking volumes (and adding true blocking volumes will make no difference) and to the outside. If you instead add another block, and turn it at 45 degrees and place it in the corner, the passage will be blocked. But if there is a physics box near you, you can still get through the wall.
However, I think this is really a bug. It seems the blocking mechanism isn’t taking into account that one direction is already blocked. And it’s the switching of sensing the two volumes that cause it to eel it’s way through what is really impassable. Or that is what it looks like anyway, by observing the motion.
UPDATE:
Fixing the mesh collision from a sphere to a convex hull solved it for the most part. But if getting a box between you and a wall, will still push you into the wall.