I can find a lot of structures on superflat (overworld preset) - igloo, jungle temple, boats, etc. (considering that the world is generates a plains biome)

Seems weird but it would be a nice feature to keep in the game, taking in account that the only biome that can be found on superfalt - overworld is plains, only generating villages as surface structures.

I signaled this bug not because I want it to be fixed but so you can consider fixing it or implementing it as a feature in the next snapshot!

Thank you for taking my feedback into account!