same issue here, FB20267253

I don't know iOS 18.3, but iOS 18.5 + background audio can't.

Hi, I'm having an issue with HealthKit background delivery on watchOS 11.3.1, I'm using HKObserverQuery and I'm experiencing CSLHandleBackgroundHealthKitQueryAction watchdog transgression crash. I confirm that I have called HKObserverQueryCompletionHandler correctly and in time. Is there any special requirement for the code to call HKObserverQueryCompletionHandler? For example, does it have to be in the main thread?

Got it, thanks for your response.