In my case (Xcode 13.1), setting the Scroll Edge appearance in Storyboard results in crash on iOS 12.4:
Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named UITabBarAppearance because no class named UITabBarAppearance was found
So I'm not sure if the warning can be safely ignored, unless you are sure that this particular Storyboard/XIB will not be loaded on older system version.
qbba.lys
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