iPadOS 15 UITabBar title cut off
Solution 1:
For some reason, it seems that setting the titleTextAttributes is what causes the problem to happen with inlineLayoutAppearance, and including the default paragraph style of NSParagraphStyle.default fixes it.
For your code, the following changes should fix it (as of iOS 15.0).
let normalAttrs: [NSAttributedString.Key: Any] = [.foregroundColor: ThemeColor.gray, .paragraphStyle: NSParagraphStyle.default]
let selectedAttrs: [NSAttributedString.Key: Any] = [.foregroundColor: ThemeColor.red, .paragraphStyle: NSParagraphStyle.default]