MDD means zero, zip, nada, nothing of value is generally considered NOT a true doubled die because of the various duplicities of working dies. If the master hub makes one of the many working Hubs (MDD) this is the cause. DDO / DDR happens when the working hubs are effected, not the master hubs.
OP may mean that listing as a DDR will soon be debunked as a true error, like the 1972P MDD
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