Crafting materials panel won’t be able to close/open anymore, if the player close the inventory when the panel is closing/opening. It’s seems the animation is interrupted thus the button is disabled.
- Lanch into game.
- Open inventory.
- Press “Crafting Materials” panel, and at the same time,
- Close inventory. (by pressing “i”)
- Open inventory again, you will see the button has two arrows now, and will not work until you leave the game.