Area Effect Clouds produce white swirl particles as well as their expected particle type

Summon an area effect cloud with any valid visible or invisible `Particle` set. You will notice that both that particle and white `entity_effect` swirls appear.

 

/summon minecraft:area_effect_cloud ~ ~ ~ {Particle:"block stone",WaitTime:1200}

 

/summon minecraft:area_effect_cloud ~ ~ ~ {Particle:"witch",WaitTime:1200}