When Collar Tags enchanted with Healing Aura or Blazing Protection are removed from a pet by giving them a different collar, they behave unusually - the new collar tag that is given is converted to a Healing Aura/Blazing Protection collar. Blazing Protection is weirdly inconsistent, as it only replaces certain enchantments, but Healing Aura will override any collar. See attached videos for examples.

(^ Healing Aura ^)

(^ Blazing protection ^)

Minecraft version - 1.19.2
FML version - 43.1.53
Citadel version - 2.1.0
Domestication Innovation version - 1.6.0

But it's hasn't been fixed yet.

Yup. This is still a problem with Healing Aura. At first thought this was enchantment exclusiveness making weird stuff but trying to add Psychic Wall to a collar with Healing Aura will just copy the old tag. Probably the current workaround is to max out the collar with compatible enchants then add Healing Aura/Blazing Prot at the end

Edit: That wouldn't work either way if a pet is already affected by it :( you would have to add it to a new pet unless there is a way to remove the collar without swapping