Because it's using a standard mapping layer system, the tiles at zoom level 9 have numbers that are half as big, and zoom level 8 is half as big again. If you know the bad tile at zoom 10 then halve each number and round down.
So (496, 692), (497, 692), (497, 692) and (497, 693) at zoom 10 are covered by 248, 346.
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