In single biome worlds, the terrain doesn't always match the biome (oceans can generate in plains and vice-versa)

I was able to reproduce this when generating a dripstone cave biome world.

Happens with Jungle and Desert worlds too. Features such as villages and ruined portals often appear floating in the fake oceans too.

This is caused as the game can now create certain factors without making it a biome, like rivers of all kinds will generate in these worlds without the need for a biome. Idk if this is intended but it might just be since it does allow single biomes to have these factors.

This issue is set to RESOLVED, but in 21w42a and 21w43a it is not. E.g. ocean-types of single biome are generating as desert (warmer ocean types) or as cadaveric plains without animals (colder types of ocean) ...

The resolution is "works as intended"

Seems like it's not as actually intended since it's spawning Plains terrain instead of all ocean, just raise the ocean height for this preset or something and it will be better for people who want to play an ocean world with terrain instead of superflat with no terrain and all water

I am adding my own personal experiences with this issue to this thread. You will find an ocean biome with vast fields, rivers, and lakes (seed #: 06252022), a desert biome with a vast ocean (seed #: Thereoncewasashipthatputtosea), and a frozen ocean with an above sea level ocean structure (random seed). It would seem that the sea level is not at the right height and thus results in structures that would normally spawn on the sea bed above sea level.

Please do not leave comments on this ticket. This was resolved as "Works As Intended", meaning it is not considered a bug and will not be fixed.