Realms main menu icons do not render translucent pixels correctly, but accessibility/language icons do

The bug

Giving the icons used on the main menu translucent textures results in mixed success. The accessibility icon and language icon correctly render translucent, but the icons shown on the realms button are not for some reason.

I do not know if MC-269186 is at all responsible.

How to reproduce

1. Download and apply the attached resource pack
2. Look at the main menu

Expected results

All five icons would look the same in terms of colour.

Actual results

The three on the realms button are more striking due to not handling alpha correctly.