Below is a link to official rules I found for Bet365 concerning bets on over/under for suspended games where the over was already hit before the suspension, as in today's Reds vs Pirates game. Can anybody confirm whether this is the industry standard? Certainly makes sense that it would be.
Game Total, Team Totals, 3-Way Totals and Alternative Game Totals - Subject to 8 ½ innings rule EXCEPT where the total has already gone over, (if total has already gone over the quoted total, then bets on the over will be settled as winners, with bets on the under settled as losers) or where the natural conclusion of the game would have meant the outcome of the total quoted would be determined, e.g. MLB game is called, or suspended at 5-5, bets on Game Totals of Over 10 or 10.5 would be settled as winners, with bets on Under 10 or 10.5 being settled as losers, since any natural conclusion to the match would have at least 11 runs.