The bug

The crafting help unsuccessfully tries to fill up incomplete stacks with the same item but a different sub type when you shift click a recipe which allows multiple or any sub types, such as creating a wooden button from any type of plank. This results in the items of the different sub type being deleted.

How to reproduce

1. Place two kind of planks in your inventory, but make sure the first stack is smaller than the maximum stack size

   /give @p planks 32 0
   

   /give @p planks 64 1
   

2. Make sure you have the wooden button recipe unlocked

   /recipe give @p minecraft:wooden_button
   

3. Open your inventory or a crafting table
4. Shift click the button recipe
   → The spruce wood planks stack is reduced to 32 items