When generating new land, peaceful mobs are spawning in the south west corner of a block causing them to suffocate if there is a block next to them. They should spawn in the middle of a block.
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wobst.michael
Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.
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Issue seems resolved in 15w42a, however found another bug with mob spawning.
wobst.michael
Then please create a separate report for the bug you just mentioned, @unknown
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It's already been posted (MC-92729)
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This issue however has been resolved.
Might be the cause of "horses suffocating on world gen".