This issue is so far only iOS 12.3. I discovered this issue right after updating iOS.
Using the Handheld AR project, deploy to iOS 12.3 and run the application. The application will hang on splash screen. Go to your apps settings and simply toggle camera permissions, OR reboot the device, and the application will work normally.
Anyone else run into this?
I have already posted this as a bug submission, just curious if anyone else is having this oddness as the Epic team is unable to replicate so far.