Shift-clicking a recipe from the recipe book into the crafting grid whilst using a crafting table duplicates the item in the offhand if the item in the offhand is required in the recipe.

Issue occurred when crafting a 1.14 lantern. Iron nuggets were in player inventory whilst torch was in offhand. Attempted to craft a lantern via shift-clicking the lantern item in the recipe book. Lantern recipe was assembled in the crafting grid per usual, however, when the actual lantern item was crafted the torch in the offhand was not used. This occurred even though there were no other instances of the torch item in the inventory.