Describe the bug
Zombies from a spawner can have and drop dungeon tactics' version of silver armor, the armor can't be smelted down or repaired so its a totally useless clog, have yet to see if other mobs can spawn with it.

To Reproduce
Place a zombie spawner and wait for one to spawn with dungeon tactics' silver armor.

Expected behavior
Ice and fire's silver armor should be equipped and drop-able instead.

Screenshots

Info (please complete the following information):

• Modpack Version: 2.77.5
• Server or Singleplayer: Server
• Version the world was created on: 2.77.4 but the area with the spawner was not generated until 2.77.5.

Additional context
If it helps I was using the sea-level structure with 8 zombie spawners on the over-world.