I'm experiencing this exact issue. Whenever I add health capabilities the watch bundle identifier needs to be changed from ".watchkitapp" but once i change it I get the above issue

I'd like to also second this opinion. I was incredibly excited to see the testing functionalities that was added to StoreKit. StoreKit is one of the most challenging frameworks to test but also one of the most important ones for us as developers. This is why I was very disappointed to learn that I am unable to have my receipt validation be part of this testing flow. If we could somehow send these receipts to the sandbox server to get them it would make our lives as developer much easier.