No Gravity mobs move with moving attribute is 0

This command summoned a moving no gravity stray

summon minecraft:stray ~ ~2 ~ {NoGravity:1b,Attributes:[{Name:generic.movementSpeed,Base:0.0d},{Name:generic.followRange,Base:64.0d},{Name:generic.maxHealth,Base:50.0d},{Name:generic.knockbackResistance,Base:1.0d}],Health:50.0f,ArmorItems:[{},{},{},{id:"minecraft:player_head",Count:1b,tag:{SkullOwner:{Id:"31152fb2-cb1e-45c3-86dd-b23f7a20a6f8",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNjhkMjE4MzY0MDIxOGFiMzMwYWM1NmQyYWFiN2UyOWE5NzkwYTU0NWY2OTE2MTllMzg1NzhlYTRhNjlhZTBiNiJ9fX0="}]}}}}],ArmorDropChances:[0.0f,0.0f,0.0f,0.0f],HandItems:[{id:"minecraft:bow",Count:1b},{}]}

Is this a wrong command, is this a feature, or a bug? Please help me