Put the summary of the bug you're having here

What I expected to happen was...:
Skeletons do flee from wolves (tamed or wild) both in overworld and in the nether regardless of Y Coordinate

What actually happened was...:
Skeletons do not flee from wolves (tamed or wild) in the nether/overwold when spawned at Y140+.

Steps to Reproduce:
1. Put wolf on the ground at height of 140Y or more (optional: block it so it can't chase)
2. Put a skeleton on the ground in the nether
3. Skeleton does not flee from wolf, but stands idle