Has Oasis Springs Always Been Partially Green??

So, I never play in Oasis Springs, but I decided to do a save of a planetary colony in a harsh desert world. However, when looking through the neighborhoods in Oasis Springs, some of them are sandy, like I'd expect, but some of the neighborhoods have green grass both in the lots and in the areas around the lots (so I can't change it). Has it always been this way, or did something change with a patch??

I took all my mods out of my mods folder to make sure it wasn't something I was doing that was causing it. I'm very annoyed that it isn't all sandy. What's the deal?