Changing to @Attribute(.ephemeral) worked for me too. Thanks @henningko !
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Maybe it's because HKQuantitySample does not conform to Coddle, @rolandkajatin ?
Not sure if it will work, but you could try using @Attribute(.transformable) by creating a struct than holds the info needed to recreate the HKQuantitySamples in your array...
Interacting with tvOS simulator: https://developer.apple.com/documentation/xcode/interacting-with-your-app-in-the-tvos-simulator