The bug
A iron golem / VillagerGolem creates walking particles all the time, even when it is not moving. This also results in NoAI:1b
VillagerGolems creating particles
How to reproduce
Summon a VillagerGolem with NoAI:1b
/summon VillagerGolem ~ ~ ~ {NoAI:1b}
Notes
A NoAI:1b
golem, when pushed (or when summoned to ~ ~ ~) will create particles for about ten seconds.
Can confirm.