I cant believe you didn’t go through all 1,000+ posts and see us discussing that...
...but yeah, it really is interesting.
EDIT: Sorry...just read your correction. I couldn't say...but as far as I have seen, the 3D buildings were always like this and covered the same area for the past few years. But as I mentioned, they will change with the update as they did in San Francisco as we discussed at the very beginning of this thread.
I gave this a bit more thought this morning as I reread my posts on this (Texas and 3D). Let me give it one more shot.
This is the style I saw before the latest update (for Austin Texas).

Before 3D update this is the style I saw (using San Antonio Tx as an example):

After the last update the shapes are missing. (Austin Tx example)

Hope this helps. Thx for your patience.