Missing Husk, Polar Bear, and Stray Sounds

I've noticed that multiple times that i've launched the snapshots that the game output says that there are missing sounds for the Husks, Polar Bears, and Strays.

I have an example right here:
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.husk.death
[8:37:25 [Client thread/WARN]: Missing sound for event: minecraft:entity.husk.hurt
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.husk.step
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.ambient
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.baby_ambient
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.death
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.hurt
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.step
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.polar_bear.warning
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.stray.ambient
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.stray.death
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.stray.hurt
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.stray.step
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.wither_skeleton.ambient
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.wither_skeleton.death
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.wither_skeleton.hurt
[8:37:25] [Client thread/WARN]: Missing sound for event: minecraft:entity.wither_skeleton.step

After this, the sound system starts up normally and Minecraft launches.