i tried once as well. the cancel button then debit button appears very fleetingly.
i wasnt successful in liquidating. the dreaded receipt printed twice and the cashier starts becoming suspicious and asked me whether am i using GC. i played dumb and quickly used my backup VGC and all was fine again. thankfully cashier didnt force me to hand over the failed MGC that i was using

in my opinion, not worth the repeated tries, effort or suspicion, if i cant get it right. just go to PO to liquidate the MGC