I see what they did. The "3D" building shapes are basically a raised footprint of any of the ground buildings. On your pictures, you can see that the little "houses" on the right image create a full-height 3D model.
Too much automation, I guess.
It would be nice to have some transparency. Maybe as an option?
This is clear to see when looking at the mini Eiffel Tower. Its the area of the base raised to the height of the top.
What's interesting is that this is now just available in beta 2 the same day that beta 3 dropped. Was it lurking in b2 waiting to be turned on? I don't know, Margo.