As I mentioned in the Title, the config in Steps To Reproduce would result in a faulty display of the quantityBar.
The following change adds the ability to use Items with a quantityBar to be stackable in Slots with different (higher) varStackMax sizes.
Use cases:
Instead of having Stacks with Numbers like Ammo/Nails -> quantityBar could be used (total amount could still be displayed via stackedUnit = "pc."; inside the Tooltip).
The same could be done for the Damage too.
In the end, it would clean up the UI from the usage of normal numbers, resulting in a more unified look for the Client.
Additionally not having the potential Overlay/Cut-off text by larger numbers (>100) and also a clear indicator if the Client can put more Items on an existing stack, which is imho a big plus in terms of UX.
Edit: Rewording*
Edit #2: Additional Info regarding Vanilla Items compatibility (for Items with 100 Item Stack Size) - All in all, these changes should be added directly when creating the model configs themselves.
Edit #3: Code update, to be (hopefully) fully compatible with Vanilla Items (multiple Items like WaterBottle, CarBattery, etc checked)