I found few issues in application and fixed them. Additionally I needed to disable bitcode publication feature as for some unknown reason it caused failure in application upload to AppStore. It took me some time before I was able to identify cause of this issue.

I encountered few issues when I tried to release second build to TestFlight for testing. Some of them were difficult to find as app normally worked when deployed from Xcode but failed to work when installed/updated using TestFlight. Finally I found that issue appears only if application is compiled in Release mode and works fine in Debug mode. After that I was able to fix issue with NPE in XMLParser bridge code (I use libxml2 which is in C and I access it from Swift which is possible only using bridge and in Swift3 there was a lot of changes related to memory management and bridging code).

Fixed issues found during test flight and released new build for testing

Created new build for TestFlight with version bump and proper setting for ITSAppUsesNonExemptEncryption