Hello! While playing I discovered a duplication glitch. I created 2 gold backpacks, and put food, crafting, and magnet upgrades in both. When I had one in my hot bar, and 1 in my inventory, the inventories would sync up, and when pulled down into my hot bar together, they acted separately. So I was able to duplicate items over and over again. Huge glitch

Am able to confirm, might need to submit this over on Sophisticated Backpacks issue tracker.

I am sure that both of those backpacks have the same UUID - just check with advanced tooltip on (F3 + h).
And the only way I know of duplicating UUID like that is through use of creative to just dupe the backpack or by placing it down in creative which leaves second backpack in hand. if you've got it in different way I will need steps to recreate.

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