Players Disconnecting In Dungeon Replaces Inventory

I had a player disconnect in a Dungeon that has Dungeon Inventory enabled (the setting that separates Overworld inventory from Dungeon Inventory). This player logged in a couple days later, after numerous server restarts, and they were in the Overworld with their inventory from the Dungeon. Their inventory before they went into the Dungeon was gone. The Dungeon the player disconnected from does have the 'kick AFK players' setting enabled and it's set to 5 minutes. The server did not restart until hours after the 5 minutes had passed.