Very, very, incomplete mansion. There appears to be one full wall, and nothing else. Possibly due to being in/over water? Generated at coordinates 9656//29864. First mansion was fine at -10632//-8744
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I was unable to reproduce this when generating the world freshly in 16w39c, based on the seed provided.

Looks like MC-96998.

I had a similar issue with my Minecraft seed. The nearest woodland mansion that generated basically only included one hallway and a wall. No Illagers spawned either. I'll probably have to look for another mansion, but it's likely thousands of more blocks away.