Using Per-face UV mapping causes the pixels on the texture to scaled weirdly/become slightly blurry

When creating a geometries with Per-face UV mapping, the pixels on the texture will be scaled weirdly/become slightly blurry, this wasn't the case on Box UV mapping.

Steps to reproduce:

1. Download the attached pack, it contain a Husk models using Per-face UV mapping
2. Join the world without activating the packs, then summon a Husk
3. trap the Husk using boat or minecart, then take a screenshot
4. Exit the world, activate the packs and join the world, then take a screenshot
5. Open the screenshots and compare it

Expected results:
The pixels on both UV mapping method are scaled properly.

Observed results:
The pixels on the Per-face UV mapping are scaled weirdly/become slightly blurry.