Keep the value in coin.data and attach the overlay as a child of the symbol's view; on an in-place swap re-attach it from data (the new instance has a fresh view), and on a flight rebuild it onto the flying clone from the same data.
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Coins, values, collectors & jackpots
How do I attach a value overlay (100x, a jackpot label) that survives an in-place symbol swap and rides along when the symbol flies?
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