Just taking a stab here but maybe the rule in this case is that since the outcome of the play didn't change that the coach lost the challenge. Yes, there was a fumble, but the possession didn't change.
Similar to a 4th down play in which a player is marked short of the yard to gain. Coach challenges and the spot is determined to be wrong but the team still doesn't make a first down when the ball is re-spotted then the team is still charged a time-out.
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A-hole formerly known as BNR
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