missing sounds for some events

In the log I found this: 

 
21:55:50.367
Missing sound for event: minecraft:item.bucket.empty_tadpole
21:55:50.367
Missing sound for event: minecraft:item.bucket.fill_tadpole
21:55:50.368
Missing sound for event: minecraft:music.overworld.deep_dark
21:55:50.368
Missing sound for event: minecraft:entity.tadpole.eat
21:55:50.368
Missing sound for event: minecraft:entity.tadpole.grow_up
21:55:50.368
Missing sound for event: minecraft:entity.tadpole.step