/spreadplayer not working with entities

I was trying to spread armorstands(Tag: spreadstand) relative to a zombie(Tag: spreader)
when i did
/execute @e[tag=spreader] ~ ~ ~ /spreadplayers ~ ~ 0 2 false @e[type=Armor_stand,tag=spreadstand]
it did nothing but when i executed :
/spreadplayers ~ ~ 0 2 false @e[type=Armor_stand,tag=spreadstand]
as a player it worked

-i dont know if this is a execute bug or a spreadplayers bug?-
EDIT: ONLY DOESNT WORK IN A COMMAND BLOCK