`CraftItemEvent` does not fire for each item when multiple items are crafted in one click

Expected behavior

If a player crafts multiple items in a single click (for example, places stacks of iron in a crafting grid to make shears, and then shift-clicks the result to get multiple shears), either the event should fire that same number of times, or it should fire a single time and we should get access to a List<ItemStack> (or similar) containing the items that were crafted, instead of just CraftItemEvent#getCurrentItem, which only gives us the first item that gets crafted, ignoring the subsequent ones.

Observed/Actual behavior

The event only fires once, even if multiple items are crafted in a single click, and we don't get access to any of the subsequent items.

Steps/models to reproduce

1. Create a plugin that has a listener for CraftItemEvent that prints a debug message when called.
2. Place more than 1 iron ingot in a crafting grid slot, and then more than 1 iron ingot in another crafting slot in a way that would craft shears, and then shift-click the result slot.
3. Observe as multiple shears get crafted in a single click, but the debug message only gets printed once.

Plugin and Datapack List

N/A - happens with plain Paper.

Paper version

This server is running Paper version 1.21.11-127-main@bd74bf6 (2026-03-10T02:55:23Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT)

Other

No response

Start by tracing CraftItemEvent from the crafting result click described in the reproduction, focusing on how shift-click crafting handles multiple output items. Confirm the behavior with a listener that logs each event and determine whether completion should mean one event per crafted item or one event exposing all crafted items; verify the chosen behavior with a regression test.