What I did:
Used a resource pack to change the sounds of a boat (entity.boat.paddle_land and entity.boat.paddle_water) to longer sounds than the Minecraft default.

What I expected:
Sounds to wait until the last sound ended, and the sounds not being constantly playing until the last one ends.

What happened:
Sounds were playing over themselves, meaning that sounds were "Shadowed" by other ones of the same resource pack.

How to replicate:
Make a Resource Pack that changes any of the 14 boat sounds in assets/minecraft/sounds/entity/boat
6 sounds are paddle_land1-6.ogg
8 sounds are paddle_water1-8.ogg

ride a boat in either ice or water, use sounds that are longer than the vanilla ones.