Same here. Seems to be a known problem as stated on the Xcode 15 RC release notes:
Interface Builder documents using custom App fonts may load incorrect font at runtime. (113624207) (FB12903371)
Workaround: Set font manually in code.
Alberto R.
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
Last seen
User for