0. ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For Example 1.19.2-8.2.10)

1. Describe the bug
   When shift+clicking stackable items into a backpack, said item count does not increase after closing and reopening the backpack. This does not seem to happen when the items are being placed by dragging them, or if there is no stack of said items in the backpack

2. Write steps to reproduce the bug

3. Open an equiped backpack

4. Shift+click a stack of items with number > 1. Leave another stack of items in your normal inventory.

5. Close and reopen the backpack; the first batch of items should be in the backpack

6. Shift+click the second stack of items into the backpack

7. Close and reopen the backpack; the item cound has not increased

8. What is expected behaviour

Item count should be consistent

7. Screenshots (If applicable)

Do you use accessories integration?

Can't reproduce with multiple tries

I use it from the Curios slot in the back

Okay, I'll check that

You mean accessories? I do not support Curios in version 1.21-10.0.3

Ok, I checked, and it's actually a fork of Curios: Curios API Continuation

I do not support this mod, I support Accessories for 1.21