As the title suggests, I have found that Kavat models have empty spaces on the neck depending on their body and face type, as you can see in the image above.
Although it is not a game-breaking flaw, it is really annoying to see such gaping spaces on my Kavat which I spent hundreds of plat to buy or breed.
I hope that in the future there will be an update that can fill in these empty spaces on the model and make the connection of each body type more seamless.