i am unable to give an arrow with custom potion effects a score dont know why tried using the exact data for the arrow and still didnt work
steps to reproduce
step 1
summon an arrow with a custom potion effect heres a command to do so:
/summon arrow ~ ~ ~ {pickup:2,CustomPotionEffects:[

{Id:27,Amplifier:5,Duration:20,ShowParticles:0b}

]}
step 2
give an arrow with the bad luck effect with an amplifier of 5 a tag
/scoreboard players tag @e[type=Arrow] add test {CustomPotionEffects:[

{Id:27,Amplifier:5}

]}
step 3
try to kill an arrow entity with the tag test with this command
/kill @e[type=Arrow,tag=test]