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In US pokerrooms, one face up card gets shuffled back into the deck and anything slightly odd beyond that turns into a misdeal.
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The normal procedure is for the exposed card to be used as the first burn card.
To the OP, see
Robert's Rules of Poker for the ins-and-outs of what constitutes a misdeal.
Regards,
T
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You are totally right. Whoops. The procedue I described is what they do when someone hasn't acted yet, but the dealer didn't notice and put down another card (usually the turn card or river card).