Shulker Box dying done via Recipe Book prioritizes Shulker Boxes of certain colors over differently-colored and undyed ones, which can result in no output.

Encountered on a vanilla server.

Steps to recreate:

1. Dye Shulker Boxes different colors, leaving one undyed, and have dyes of the same colors in your inventory.

2. Click the Recipe Book recipe.

3. The same color of Shulker Box will be put in the recipe, regardless of its slot in your inventory.