If I summon an armor stand then I show up his arms equipped with an arrow (/entitydata @e[type=ArmorStand,r=20] {ShowArms:1,Equipment:[{id:arrow},{},{},{},{}]}) and I replace the arrow with anything, the arrow appeares with a 0 in my hand
MC-67347
Armor Stand Problem while summoning armor stand with arrow
Resolved
Works As Intended
0
Intended, You used the {id:arrow} to place the arrow which mean you don't specify the Count value which is 0b by default