Runtime issue with 64bit Unity game integration into iOS native app

My company integrates Unity games into our native iOS app. Basically our iOS app would run the Unity code when a user decides to launch any of the games.

With the past 32 bit of Unity and native iOS code, we were taking Unity generated Xcode project files, and compile them into a static lib for the native iOS app to use. Whenever the user chooses to launch any of the games, UnityAppController would be loaded, and ran. This worked well for us.

But with the latest 64 bit builds, the same...

Runtime issue with 64bit Unity game integration into iOS native app