Describe the bug
Items Stacking is broken since 7e12ad2

To Reproduce
Steps to reproduce the behavior:

1. Get 64 torches in your hotbar
2. Place one torch
3. Mine and pickup the placed torch

Expected behavior
When you pick up the torch, it should be merged with the remaining 63 torches in the hotbar. However, the torch is placed on a free spot of the inventory.

Mod Versions (please complete the following information):

• Minecraft Version: 1.17.1
• Fabric API Version 0.37.0
• Release Version 1.3.0, since 7e12ad2 in repo

Looks like the DurabilityMultiplier changes add an empty tag-entry to items in the inventory which prevents stacking.

Fixed with #42