Visual bug with extrusion?

As far as I know, I experienced it and it didn’t work this way.
I have just been doing a post with a couple of faulty examples in the doc and playground examples.
I’m updating the post just know as i keep on finding new ones with the same issue.

Edit: but you’re right saying that not all constructors (mesh builders) act the same. And this is also kind of annoying, isn’t it?