When crafting multiple of the same item, you cannot press a number key to get them all into the same hotbar slot, even if that slot isn't full.

https://www.youtube.com/watch?v=80NVqiPe3yE

This report has been resolved as "duplicate" but the issue it duplicates is different. If you craft multiple torches together and you press a key to get them in the same inventory slot, only the first set is created and the others remain as ingredients in the crafting grid.