Recipe book buttons and icons do not render translucent pixels correctly

The bug

Assigning the buttons and other sprites used inside of the recipe book UI textures containing translucent pixels will cause these pixels to incorrectly render opaque in-game.

MC-165182 handles the outer frame texture of the recipe book, MC-270051 the recipe book button which is part of the main inventory, and MC-270678 the tabs.

How to reproduce

1. Download and apply the attached resource pack

2. Look at the recipe book

Expected results

The buttons and such would be translucent, just like the texture files are.

Actual results

All of them are entirely opaque.