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I was also looking it up, and it said the thing about excess chocolate, so that's weird. You are right, though, that's a really stupid thing to add.

The real reason is that chocolate is applied on a conveyor belt and extra chocolate drips onto the bar. Not all of the excess is successfully blown away so you get that vein in the middle.

Wait no, I came up with a cooler explanation.

That's where they put caramel.