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Just replayed DoD for the new overrides and ability to purchase spider silk. Encountered a bug during the final boss fight that replaced Arrav with the player. After completing the quest and re-entering New Varrock all items equipped and in the inventory were removed.
Lost a chromatic partyhat, 80k zm, and a full set of studded armour
Seems to be related to this line in the patch notes:
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Players inventories will now correctly restore if they log out during the Arrav fight in Dimension of Disaster.