Where is the witchery spirit world inventory saved?

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I just encountered a bug in witchery (i suppose) which made it such that on death, my inventory was not saved but put in a gravestone instead. It is a pain to get it back, plus it contains baubles that should have stayed in the overworld, but got put in the grave as well. I would like to try to transfer the gravestone content in the normal witchery inventory, but I can't find where it is saved. Please tell me in what NBT tag that inventory should.
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3 Ways To Bypass The Witchery Mod's Spirit World Embargo
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