Okay, this is not TECHNICALLY a bug, but I've learned that the sliced fuselages still interact with the ground as if it was a full block. I am making gear doors (which look gorgeous, thanks to the devs), but the doors interact with the ground and are pushed up out of view and damaged, even though my landing gear are there. I hope you see this

Edit:
Okay, I just did some research, and I'm sorry for wasting your time, devs. Basically, they added a collider (spelt just like that) as a new input under the fuselage section of XML. When you go to it, hit the + at the bottom, and write collider on the left side. On the right side, you can put anything you want, NonConvexMesh, ConvexMesh, Auto, and I believe Normal. ConvexMesh fixes the interaction with the ground if you do not want it (although, using the interaction with the ground could be cool for a hovercraft...)