Allow selection of multiple accepted items in GUI Slots

Upvotes: 4
Issue description

Just like shulker boxes, we cant put shulker boxes in shulker boxes. It would be great we can make that with custom backpacks. 

Like I want that we cant put shulkers in backpacks or small backpacks in big backpacks.

Issue comments

we cant put shulker boxes in shulker boxes

I think we can't put a shulker box inside another shulker box.



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