[MC-190518] Villagers and seeds generate on y0

Using "floating island" preset, when some villagers generate, they generate on y0. Seeds also generate with this and don't instantly break.

Environment

Windows 10, Java 1.8.0_51 64bit

Duplicate of MC-128659

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We're tracking this issue in MC-128659, so this ticket is being resolved and linked as a duplicate.

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