How To Reproduce:

• Have >1 Chest and >9 Iron Ingot in inventory
• Find Hopper in recipe book
• Shift + Left Click Hopper in recipe book
• Only 1 set of items inserted into crafting table

Expected to load crafting table with as many item sets as possible

Working Example:

• Player has 18 iron bars
• Shift + Left Clicks Iron Block in recipe book
• Puts the amount of items necessary in the crafting table to craft 2 iron blocks (2 iron in each slot)

*This may apply to other crafting recipes