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

v1.20.4-9.4.0 on fabric

1. Describe the bug

After picking up the backpack from the ground, it's not in my inventory, but it renders on my back.
How do I get it off.

2. Write steps to reproduce the bug

(0. Turn off other mods, and start a new world)

1. get a backpack (exemple, by using creative mode)
2. place backpack on the ground. (shift click)
3. pick the packpack up from the ground (shift click)
4. open your inventory (no backpack in there)
5. switch to 3th person view (the backpack is rendered on your back)

3. What is expected behaviour

Backpack visible in my inventory, i guess.
Some way to take the backpack off.

4. Screenshots (If applicable)

click b to open inventory... (if b not works check in controls)