If you happen to have this command running in your world then relog.
/effect give @e[type=minecraft:pillager,nbt={CanPickUpLoot:1b}] minecraft:glowing
All pillagers data are set to CanPickUpLoot:1b
MC-278153
Relogging causes all pillagers to have their CanPickUpLoot tag set to true
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Can confirm with naturally-spawned pillagers from a pillager outpost.