Two things the concrete delivery driver will guarantee: "it will harden" and "it will crack".
They use an isolation membrane under tile in all the new houses today. They did not do that 15 years ago...
If it was mine, or if I wanted it to be mine, I would plan on re tiling that area (I would want new color and style, not match 15 year old tile) and put a isolation membrane down so the crack does not come back thru the new tile.
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