Storyboard ignores custom fonts on labels and buttons when size classes change font size

Originator:sash
Number:rdar://24231676 Date Originated:18-Jan-2016 03:45 PM
Status:Open Resolved:
Product:iOS SDK Product Version:iOS 9.3 beta 13E5181f
Classification:Crash/Hang/Data Loss Reproducible:Always
 
Summary:
When using custom fonts with UILabel (UIButton, …) in storyboards, enabling different font sizes for different size classes makes storyboard ignore custom font and fallback onto the system default font

Steps to Reproduce:
Please run project attached. The setup of the project is extremely minimal: UILabel with font set to a custom font supplied with the demo app.
Size class for regular width and regular height is set to a bigger font size.
Running app on iPhone or iPad renders the default system font instead.

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