Missing sound events warnings in game output log

Following messages appear as warnings in the game output log:

12:14:46.620
Missing sound for event: minecraft:item.bucket.empty_tadpole
12:14:46.620
Missing sound for event: minecraft:item.bucket.fill_tadpole
12:14:46.621
Missing sound for event: minecraft:music.overworld.deep_dark
12:14:46.622
Missing sound for event: minecraft:entity.tadpole.eat
12:14:46.622
Missing sound for event: minecraft:entity.tadpole.grow_up
12:14:46.622
Missing sound for event: minecraft:entity.tadpole.step