Problems w/ detecting when a player closes a barrel with scoreboard linking system

if i wanted to run something when a barrel block is closed with the method i'm using, it would work properly only when there's one block. execute as @e[tag=block.placed,type=armor_stand] as @s at @s unless block ~ ~ ~ minecraft:barrel[open=true]{CustomName:'"Block"'} as @a at @s as @e[tag=block.placed,type=armor_stand] if score @s block.ui.index = @p block.ui.index run say DEBUG TEST this code will only work if there is one armor stand with the "block.placed" tag. Otherwise the thing would run the command when it OPENS