I wanted to create some particle auras around mobs that also applied some area effects when you got close to them.

I found that potion and status effects assigned to the entity would not apply to players standing within their hitbox (confirmed using F3-B) IF the entity was riding another one.

As soon as I killed the entity they were riding the potion or status effects would immediately start applying to me. The same AreaEffectCloud entity data summoned without riding another entity applied the effects perfectly so this seems to only be an issue when the effect cloud is riding something else.

It would be nice if this could be fixed and effects could be stored in the riding effect clouds as it creates a nice mobile version of the AreaEffectCloud entity. Right now I have to use /execute and /effect in a seperate command block to get around the bug which introduces unneeded lag.