watchOS 10. GPS locked to Watch - Developer has no choice to select phone's GPS?

Under watchOS10, seems like Apple Watch always uses watch GPS and cannot use iPhone's GPS, previously developer somehow can use either Apple Watch or iPhone's GPS, when iPhone is around the Watch and if developer choose to use iPhone's GPS, then iPhone's GPS will be used in watch app. However, watchOS10 behavior is different where Watch's GPS is always used. Is it the new behavior for watchOS10 ?

watchOS 10. GPS locked to Watch - Developer has no choice to select phone's GPS?
 
 
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