1- When Head Bags combine in the inventory, only one of them becomes usable.
For example, I cut off a wolf's head, then killed a deer, and finally a bear. These heads stack in the inventory as 3x, but only the first collected Wolf Head becomes usable. Setting the stacking option to 1x would resolve this issue.
2- Wrapping Papers render items into gift packages. However, when these gift packages combine, they become unusable. Setting the stacking option to 1x would solve this problem. For instance, if I wrap a weapon and there is already a wrapped gift in the storage, combining them renders the item useless, as it doesn't unwrap when separated, essentially becoming waste.