Recipe book button renders translucent pixels as opaque

More loosely relates to these issues: MC-144009 MC-145821 MC-164001 MC-165403

The bug

If the recipe book button texture includes translucent pixels, these will be rendered fully opaque in-game.

How to reproduce

1. Download and apply the attached resource pack
2. Enter the inventory, a crafting table, or furnace/blast furnace/smoker

Expected results

You should be able to see through the recipe book button. I've cut a hole in the inventory textures, so you should be able to see the world behind those buttons as well.

Actual results

A solid, opaque pink/orange rectangle.