This is the same issue that my app faces with iOS18, although using Objective C in place of Swift. The background sync is scheduled to execute every 10 min, but sometime it executes after 1 hr and sometimes completely misses the execution.
Moreover the BG sync is also skipped when not connected to power. Looking for quick resolution !!
AsifIqbal
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