Skeletons/Strays with melee weapons in water hiding from the sun can't decide if they should target the player

The bug

When you summon a skeleton/stray with a melee weapon in water, during the daytime, it won't be able to decide what to do.

How to reproduce

1. Summon a skeleton with a melee weapon in a pool of water:

   /summon skeleton ~ ~1 ~ {HandItems:[{Count:1,id:diamond_sword},{}]}

2. Go onto land near the skeleton and go into survival mode. Observe the skeleton's strange behavior.

Demonstration: https://www.youtube.com/watch?v=TuJMg0toTzg&feature=youtu.be