Vehicle Wheel Collision Mesh not Visible after Adding Components to Blueprint

I’ve set up some vehicles (armatures only) with the Vehicle Wheel BP and the cylinder Collision Mesh. This works fine. In this process, I use the Console Command, ‘pxvis collision 1’ to view the wheel collision meshes.

However, after I add static mesh components to the vehicle BP (windows, spoilers, etc.), the wheel cylinder collision mesh is no longer visible.

Is this a bug? By design?

And yes, I realize that I should probably perfect the wheel collision before adding other components…