I think I may of found the problem. The reviewer was testing it on watchOS beta 4, which does not have the symbol. It appears this specific symbol is available starting on watchOS beta 5, which is why I can’t replicate the crash since the simulators are on beta 5.
Rainyvengeance
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
Post
Replies
Boosts
Views
Activity
It takes a a day or two to go through.