Realmsのワールドとローカルのワールド間のコマンドの不具合

im japanese,so icant use english superbly.but i make an effort.i watch this error when playing realm world.use command is " testfor @e[name="鉄のツルハシ"] "鉄のツルハシ is iron_picaxe.anyway,ill use them. but it no warking.im suspicious,out realm world.next,i tried the same command.then,its worked!

realm world cant use testfor @e[name='itemname']but local world can use that.pls fix