The Breathe Fire animation got updated back then as the 0.2 second cast time was added to the spell. It was updated for the knight model, and for all the dragon models.

However, for some reason, new custom dragons added after that patch use the old animation. Dragons added after that patch are:

1. Bitterwing
2. Dragon of the Third Awakening

These 2 dragons use the old animation. They are also missing their generic_channel animation, probably for the same reason why they use the old Breathe Fire animation.