Deep Warm Ocean biome is unused. It is caused by the balance of ocean generation in some 1.13 snapshot. I hope this is unintentional.
This is not a duplicate of MC-128260. That one reported that some oceans are extremely rare. My issue is reporting that one ocean is unused and never generates naturally. I do not know if this is WAI or not, but it can definitely be fixed. Because if that biome is unused, why it's been added at all? Fixing this will also be a reason to fix MC-131930
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As @unknown said, this was removed in 18w08b.
Removed deep warm ocean biomes, warm oceans can only be shallow now
See changes in the blog post: https://www.minecraft.net/en-us/article/minecraft-snapshot-18w08a
As stated in the comment above, there was an explicit mention of the being becoming unused/removed from generation in the changelog. This should be resolved as Works as Intended.
Didn't they remove this in 18w08b?