Verification builds:
1.1.4.51 Retail

Summary:
Llamas can't be healed with hay bales and wheat. They can only be fed hay bales to initiate breeding; it has no effect on their health.

Steps to Reproduce:

1. Damage a tamed llama to reduce it's hearts
2. Attempt to feed it wheat or hay bales

Observed Results:

1. Wheat cannot be fed to it
2. Hay bales only initiate breeding mode, the llamas health does not increase

Expected Results:
Wheat and Hay Bales should heal the llama.

Screenshots/Videos attached: Yes

Notes:
The behaviour pack is missing the "minecraft:healable" component in the behaviour pack. The following should be included in \entities\llama.json:

"minecraft:healable": {
        "items": [
          {
            "item": "wheat",
            "heal_amount": 2
          },
          {
            "item": "tile.hay_block",
            "heal_amount": 20
          }
        ]
	},