Logs:
Not relevant to issue

Steps to Reproduce:

1. In a world where you do not have the "Best Friends Forever" advancement, acquire fish and any dragon
2. Tame the dragon with the fish, and observe that the "Best Friends Forever" advancement is not granted despite having tamed an entity

Description of issue:
When the player tames a mob (such as a cat or wolf) they ordinarily receive the "Best Friends Forever" advancement, which is designed to trigger when the player tames any mob, and this usually extends to modded tameables as far as I'm aware. However, dragons appear to not activate this advancement trigger. This means that not only can the player not get "Best Friends Forever" when taming a dragon, but if a datapack adds an advancement for taming every dragon breed (essentially a dragon equivalent to "A Complete Catalogue" or "The Whole Pack"), that advancement cannot be obtained because dragons don't trigger "minecraft:tame_animal".