So, I don't know if this is a bug or the preset generator I'm using hates me, but there's this bug where my superflat worlds will do the layer settings I chose, but not the structure settings I chose. I tried to do the glass core challenge, which has the structure settings of decorations on, villages off, lava lakes on, water lakes on, dungeons on, strongholds on, and sea temples off. But when I try to generate it, it has villages, and doesn't have any other structures! This is my experience I've had, I don't know if this is for anyone else. I found this bug on 1.16.4 java; Please fix it if you can! (if its even a bug)