Here are some drops that changed in week 43b, and should be reviewed.

Horses no longer drop anything. Previously horses could drop leather, and skeletal horses could also drop bones and rotten flesh. It is not clear how the DeathLootTable schema could differentiate these since they are the same entity type. (addressed in 43c)

Witch potions are apparently 'equipment', and therefore not expressed in the loot tables. (Did not test if they still actually drop) (does not seem to be any bug here)

Music discs dropping from creepers killed by skeletons are not yet expressed in the loot tables. (Did not test if they still actually drop)

Mob heads dropped by electrified creepers killing certain mobs are not expressed in the loot tables. (Did not test if they still actually drop)

Baby animals have not been discussed. Previously, baby animals did not drop loot. Presumably this has not changed, so presumably baby animals are hard-coded to never drop anything, but begs the question of whether babies should have loot tables or adults should have an is_adult condition or something.

Does enderdragon get a loot table? (covered by another bug)

Does wither get a loot table?

Just want to ensure nothing gets 'left behind' as this feature is implemented.