My problem is when I run my application on both an iOS device and simulator, the fonts I had set via storyboard are not reflected properly
Custom App fonts load incorrect font at runtime XCode 15 iOS
This is called out in the Xcode 15 Release Notes as a known issue:
Interface Builder documents using custom App fonts may load incorrect font at runtime. (113624207) (FB12903371) Workaround: Set font manually in code.
It not really a solution for a project like ours with over a hundred of Interface Builder Controllers.
Manually setting fonts programmatically for 1000s of elements in an app is not viable. Absolutely need a fix for this and for custom fonts to work correctly.