Sometimes when generating or re-creating a world, with generate structures disabled, structures and features still generate. Recreate always generates features on a world that previously had features, regardless of the setting. Happens regardless of seed. Worlds recreated but then with the seed field cleared still have features.

Happens after about 7-10 world creations.

Worked on (usually recreating a world, only happened twice when not recreating)

Gold blocks

Netherite blocks

White Stained Glass

Iron Block

Steps to reproduce (repeat 5-20 times)

Create a world with these settings:

Superflat (I did 52 of a single block, nothing else)

Difficulty peaceful

Structures off

Cheats on