Armor Stand passengers rotation displays incorrectly

When I used the command

/entitydata @e[type=armor_stand,c=1] {Rotation:[180f]}

on a stand riding another stand the entity rotates, but displays incorrectly. In F3+B is is shown facing 180 degrees, but the actual stand is not.

To reproduce:

• Run this command:

  /summon armor_stand ~ ~1 ~ {Passengers:[{id:"armor_stand",CustomName:"\"TestStand\"",CustomNameVisible:1}]}

• Then this command:

  /data merge entity @e[name=TestStand,limit=1] {Rotation:[180f]}