A floor call I had never seen

[GreedIsGood]

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If the action took place before the deal, meaning they bet blind, then it's a misdeal.

If the action took place after the players received their cards then the button's hand is dead.

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But that doesn't help if the UTG acts before the deal ends. In that case the button never has a chance to let the dealer know of the mistake before action takes place.

Now I never look at my cards before it's my turn to act, but I do count them.

In this case, if the button spoke up as soon as it was clear the dealer wasn't going to give him a forth card, then I'd rule that he should get the current top card. If he waited and then noticed his hand was short, it's dead.