Just a quick update - updating to Xcode 12 beta 6 revealed a function signature change in the widget api that Xcode beta 5 was fine with. Fixing this signature solved the 'missing symbols during linking' issue on upload.
b-labs12
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
I am hitting this now as well. Xcode 12 beta 5, iPhone XS 14 beta 6
ITMS-90562: Invalid Bundle - The app submission can not be successfully recompiled from bitcode due to missing symbols during linking. You can try to reproduce and diagnose such issues locally by following the instructions from: https://developer.apple.com/library/archive/technotes/tn2432/_index.html
Following instructions installs and runs fine on my phone (with and without specific app thinning)