Custom trims are not applying to item

MythicMobs: 5.7.1
MC: 1.21.1
Core: Purpur #2296

police_helmet:
  id: chainmail_helmet
  display: "&bШлем КСБ"
  Hide:
    - ARMOR_TRIM
  Model: 1001
  NBT:
    Trim:
      material: "minecraft:redstone"
      pattern: "oraxen:police" # i also tried without brackets

image