Hi Martin, In the event that it is a premature turn card, and not a player failing to call time, the premature turn card get laid aside and then the river and river burn are placed face down on the table before shuffling the premature turn card back into the stub and reissuing the turn without burning, the river can then be issued after fourth street betting is complete, keeping the correct card for the river. RROP is specific in that any errors are corrected in a way that changes as little of the board as possible, the turn whether you make the river the turn and issue a new river or reshuffle the turn and issue a new turn the premature turn card has to go back into the stub and be reshuffled so it has a chance to play again.
Relevant rules for board errors below
Regards
Stuart
1. Once action begins, a misdeal cannot be called. The deal will be played, and no money will be returned to any player whose hand is fouled. In button games, action is considered to occur when two players after the blinds have acted on their hands. In stud games, action is considered to occur when two players after the forced bet have acted on their hands.
15. If the dealer prematurely deals any cards before the betting is complete, those cards will not play, even if a player who has not acted decides to fold.
16. If the dealer fails to burn a card or burns more than one card, the error should be corrected if discovered before betting action has started for that round. Once action has been taken on a boardcard, the card must stand. Whether the error is able to be corrected or not, subsequent cards dealt should be those that would have come if no error had occurred. For example, if two cards were burned, one of the cards should be put back on the deck and used for the burncard on the next round. On the last round, if there was no betting because a player was all-in, the error should be corrected if discovered before the pot has been awarded, provided the deck stub, boardcards, and burncards are all sufficiently intact to determine the proper replacement card.