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.
Updated description to include more detail as this report has been resolved as a duplicate to a report to a bug that's slightly different.