There is a related thread here with a workaround that I've been able to use: https://developer.apple.com/forums/thread/762711
The RC Release Notes don't explicitly mention NSDecimalRound but given what it says in there about the other NSDecimal* functions, I assume it's affected. The RC notes should be updated to include this function as well, imo.
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App Store Distribution & Marketing
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TestFlight
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