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That's a shattered substrate. You may think it never received a shock, but it looks very much like it was hit near the middle on the right hand side. Or something pressed down on it at that point.
It's just possible that this is a manufacturing fault in that some part of the internal case is not as smooth and flat as it should be and has been pressing on the screen enough that it eventually broke. But how you'd prove that I don't know.
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