Nether portal travel sound issue

Whenever the player goes through a nether portal as in walk briefly through it, the sound that initiates travel plays fully.

By this I mean that there are 2 sounds: one for the actual loading screen while going to the nether and one that plays while the player is inside the portal blocks waiting to be transferred.

It's a small issue but very annoying.

To reproduce: Walk straight into and out the other side of the inside of an activated Nether portal and listen.