Fonts cannot be shaded in resource packs

When adding a gradient to the default8.png font in a resource pack, the text colour is still flat in-game

Steps to reproduce

1. Edit default8.png or install a resource pack with a gradient on the font

2. Apply said resource pack in the Global Resources settings

3. Let the resources reload fully

4. Exit to the main menu

Observed results

No shading is applied

Expected results

Any shading should appear

* Note, colours still apply, it’s just gradients that aren’t