Underwater structures on land.
What I expected to happen was...:
World is one big Ocean.
What actually happened was...:
Normal world but biome is "ocean" and structures like ships was spawning everywhere.
Steps to Reproduce:
1. Singleplayer
2. Create new world
3. Select mode to One Biome
4. Ocean
Environment
Windows 7
Duplicates MC-126520 and MC-127518. Working as Intended.