Same situation 15.4.1 / 11.6.5 /13.2.1/watch, same error
HugoParis
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
From Xcode assistance pages, I understand that this is "normal" Xcode 13.2.1 does not support iOS 15.4 :-(((
You have to update to Xcode 13.3 and to do so, to Monterey (and loose apps compatibility, as far as I am concerned)
Finally could solve it by adding the right OS support manually in /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/