The Bug:
Players are not dismounted when riding camel husks underwater.
Riders are thrown off most land mounts once their head is underwater. Camels and zombie horses are on that list, but camel husks are not, although they were added to a similar list that makes ridden mounts float. This issue can be fixed by adding minecraft:camel_husk to data\minecraft\tags\entity_type\dismounts_underwater.json.
Steps to Reproduce:
Summon a camel husk, equip it with a saddle, and begin riding it.
Summon water over your head by using the command provided below.
/fill ~-2 ~ ~-2 ~2 ~5 ~2 minecraft:waterObserve if you are dismounted from the camel husk while your head is underwater.
Observed Behavior:
A player riding a camel husk is not dismounted when underwater.
Expected Behavior:
The player would be dismounted.