There are Floating Geodes in Custom Superflat Worlds

I made a world with only Structure Void from y0 to y200 and with Structure Generation turned off.

Then, in the Distance, I see multiple floating Geodes which was not ideal for my situation. 

Steps to Reproduce:
1. Create a Custom Superflat with Structure Void filling the majority of the world in the "y" coordinate
2. Load up the world
3. Look around and then you'll find it.