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Be sure to mention to SC the part number I provided to help them pinpoint the potential trouble area. Not every SC have the expertise to pinpoint this problem. Just in case...good luck!
I recently had my 2020 MX fixed under warranty. They replaced this part number 1098278-00-g. Basically a broken cable that activates the sliding feature when seat is folded. Hope this helps. Passenger side 2nd row.