The hills biomes still appear in the locatebiome despite being removed from the game(if you try and execute any of the commands it will say that there is not a biome of that sort within reasonable distance)

To be clear, I know that the hills biomes being removed are intentional as stated here in the update log

"

• Natural variation in terrain shape and elevation, independently from biomes. For example, forests and deserts could form up on a hill without needing a special biome just for that.

"

Its just that the namespaces for those biomes should not exist if the biomes are removed, as they are unnecessary, and clutter the autofill command options when doing /locatebiome

Also, since the hills biomes are required criteria for the adventuring time achievement, this achievement is now impossible, you can only get so far. I know that the achievement hasn't been updated however, as there are other biomes like meadows that are still unaccounted for in the achievement