On iOS 26 beta 4, those problem are not fixed yet!

I submited a feedback for this issue. FB20706282 It's serious problem for all apps. Hopefully can fix it.

It was working fine on Xcode 26 RC and with iOS 26 RC devices yesterday. Today I upgraded to Xcode 26 (17A324), then this problem occurred. Deleting all files from ~/Library/Developer/Xcode/UserData/Provisioning Profiles helps.

On beta 6, this problem is finally fixed. Thank you!

On Beta 5, the UIColor.label on the SplitViewController's primary view becomes gray(transparent), not white in dark mode. However, adding an emoji will make it white. This problem remains unresolved!

I updated to the new beta 4 (23A5297m), the problem is still unchanged. And I found that, if the label text has an emoji, it will apply the dark mode color correctly on the UISplitViewController's Primary View. It's strange. I submit the feedback FB19067917 for it.

OK, I finally figure out that's my problem with setting the size classes for iPhone 14 Pro Max landscape. Using Any width, compact height works. But there is an error in HIG documentation for iPhone 14 and iPhone 14 Pro landscape size classes. It should be fixed.