When trying to summon armor stands that hold items with data values (such as enchanted golden apples, or birch logs) the armor stand is summoned without that item.

Command:
/summon ArmorStand ~ ~ ~ {NoBasePlate:1b,ShowArms:1b,Rotation:[90f],ArmorItems:[{},{},{},{}],HandItems:[

{id:"minecraft:diamond_sword",Count:1b}

,

{id:"minecraft:golden_apple 1 1",Count:1b}

],Pose:{RightArm:[332f,0f,0f]}}

As you can see from the pictures (some include some with more simpler data tags to see if that was the issue) the enchanted golden apple was not summoned into the hand of the armour stand.