I cannot find any reference to CopresenceCore.
Is it a class or library of yours or a third party ?
It's not one of mine. According to this document: https://mroi.github.io/apple-internals/, it is an internal API:
Group Activities: SharePlay; sharing of media content and programmatic state over FaceTime calls; GroupActivities.framework, CopresenceCore.framework; launchd service: com.apple.telephonyutilities.callservicesd
Thank you
tokorobam
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
I will re-post this to make it more clear
Only two things seem to remedy this issue: 1) just be patient and wait a while (15 minutes?), or 2) switch off the Apple Watch and don't use it while you are developing.
Speculation on my part but it looks like that Apple is just too big and compartmentalized. Right had not caring what the Left hand is doing. Those at Apple who have an Apple Watch can't reach over the wall to those maintaining X Code.