If a snowgolem cannot pathfind to a hostile mob, it will never attack that mob, or track its movement. This bug breaks most of the practical uses for the snowgolems, and affects multiple types on mob farms.

How to reproduce.:
1. in a standard world, go about 30 blocks into the air.
2. Summon a snowgolem on one blocks, and then a couple blocks away summon a creeper.
3. Since the snowgolem cannot walk towards the creeper, it will not attack.
4. If you connect the creeper platform, and the snowgolem platform, then it will attack like normal.

You can find a full demo of this bug here:
https://youtu.be/yU2IXXU6UzA?t=231