K-Lo,
It might cost him chips if he were to win the hand anyway but, not a disadvantage, at least I don't see it that way. In order to fully understand this, I think we could go over a few scenarios that should help us understand it better.
Let's look at these two examples and see if it makes my suggestion the best solution:
#1 You are Player A, there are two other players. You are holding Ks, Js. The flop is 7s, Qs, 9s. The turn is the 3h. There's only one hand that can beat you at this point. You make a bet and before the other players act, the dealer exposes the final burn card, the Ace of spades!....pretty significant card, don't you think?
#2 Same hand only the exposed burn is the deuce of clubs. Rather insignificant...right?
I know there are many that want the rules to be consistent but you have to understand that extreme situations occur that require us to put logic first. There are always consequences when mistakes are made. This is a very rare happening, for sure. The decisions I suggest would be fair and would offer the best protection to all players.