Lack of mobs animation for gliding with elytra

Lack of mobs animation for gliding with elytra
to reproduce:
/summon Skeleton
/replaceitem entity @e[type=!Player,r=3] slot.armor.chest minecraft:elytra
/tp @e[type=!Player,r=3] ~ ~60 ~

Skeleton will glide forward, but will not rotate the body forward.