Passive Stationary Skeleton in the day

I loaded a world which was originally created in 1.8.8, into 14w47c, opened to LAN with cheats on.
I tp'd to an x,y,z location then slept through the night.
On waking, I went outside and saw a stationary skeleton.
It didn't respond to me. If I tried to walk into it slowly, I rebounded.
I was able to hit it only once (and saw hearts fly from it). Subsequent hits had no effect.
The arms were waving gently, but there was no other animation on it.
The skeleton should have been on fire, but wasn't

The world is too large to upload.