Testing all of the listed sounds in the sound toggles section in the config, these were the ones that don't work even when set to true:

Play a sound when activating, deactivating and running a beacon

Play a sound when applying bonemeal

Play a sound on player name mentions in chat

Play a sound when planting a crop

Play a sound when potion effects get added or removed from the player

Play a sound when spawning an entity with a spawn egg

Tested on a clean 1.12.2 forge instance with only this mod and mixinbooter installed, on the latest version of the mod (1.4.1).

As these sounds are backports from recent versions of the game, you need AssetMover to download them from MOJANG. I should definitely clarify that in mod descriptions.

I see, sorry about that. Is it just a matter of dropping AssetMover in to the mods folder or is there some extra configuration required to download the sounds?

It‘s just a drop-in!