"Error" textures in block/entity GUIs do not support translucent textures

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

The bug

The crossed-out arrow textures in cartography table, anvil, smithing table, grindstone and villager GUIs do not permit translucent pixels, rendering them as opaque.

How to reproduce

1. Download and apply the attached resource pack
2. Enter an anvil, cartography table, grindstone, smithing table or villager GUI
3. Try to do something impossible
4. Observe

Expected results

A translucent "NOPE".

Actual results

Complete and utter opacity.