Edit: Duke Scarborough pointed out that the triangles are not as they should be when viewed in wireframe mode. A little playing revealed that the stunted prim has the triangle configuration that cubes switch to when hollowed, and is now stuck with that triangle configuration instead of going back. I don't know why hollowed makes it stunted, but there you go. Copying the prim results in another stunted prim, so if you want a copy let me know.
Edit2: Er, actually it's the triangle configuration of being cut, not hollowed. So now it's stuck thinking it's cut when it's not. Still dunno why that makes it stunted.
