We have same issues.
We use custom fonts. Some UILabels' font in our app built on Xcode 15 beta were changed from 'medium' style to 'bold' font weight.
mini_ios
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We still have same issue on Xcode 15.1 beta.
I find PNG with alpha in Assets.car is compressed with 'Gray' color space.
I think 'Gray' color space is no problem.
But there is a huge difference of compression results between Xcode 14 and Xcode 15.