I'm receiving repetitive crash logs related to the UISplitController supplementary collumn. Fatal Exception: NSInternalInconsistencyException Unexpected view controller change in Supplementary column for expanding <xxxx.CustomSplitViewController: 0x15bb0bf40> I can't reproduce it and the logs have no reference at all to any of my code - I'm wondering if it can be somehow related to orientation changes. Any help would be very appreciated. Here is part of the crash log: Fatal Exception: NSInternalInconsistencyException 0 CoreFoundation 0x9904c __exceptionPreprocess 1 libobjc.A.dylib 0x15f54 objc_exception_throw 2 Foundation 0x1306cc _userInfoForFileAndLine 3 UIKitCore 0x991928 -[UISplitViewControllerPanelImpl panelController:separateSupplementaryViewControllerFromPrimaryViewController:] 4 UIKitCore 0x96699c __54-[UIPanelController _expandWithTransitionCoordinator:]_block_invoke_4 5 UIKitCore 0xb0d78 +[UIPanelController _withDisabledAppearanceTransitions:forVisibleDescendantsOf:perform:] 6 UIKitCore 0xb0940 -[UIPanelController _withDisabledAppearanceTransitionsPerform:] 7 UIKitCore 0x9668c0 __54-[UIPanelController _expandWithTransitionCoordinator:]_block_invoke_3 8 UIKitCore 0x1c6a08 +[UIViewController _performWithoutDeferringTransitionsAllowingAnimation:actions:] 9 UIKitCore 0x966814 __54-[UIPanelController _expandWithTransitionCoordinator:]_block_invoke_2 10 UIKitCore 0x174268 +[UIView(Animation) performWithoutAnimation:] 11 UIKitCore 0x966760 __54-[UIPanelController _expandWithTransitionCoordinator:]_block_invoke 12 UIKitCore 0x26fc28 -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:] 13 UIKitCore 0x529ae8 -[_UIViewControllerTransitionContext __runAlongsideAnimations] 14 UIKitCore 0x4f49ac -[_UIWindowAnimationController animateTransition:] 15 UIKitCore 0xb70dc -[UIWindow _adjustSizeClassesAndResizeWindowToFrame:] 16 UIKitCore 0x23e408 -[UIWindow _resizeWindowFrameToSceneBoundsIfNecessary] 17 UIKitCore 0x461bd8 -[UIWindow _sceneBoundsDidChange] 18 UIKitCore 0x5802e8 -[_UIScenefbsSceneBasedMetricsCalculator _updateMetricsOnWindows:animated:] 19 UIKitCore 0x2b9fcc -[UIWindowScene _computeMetricsForWindows:animated:] 20 UIKitCore 0x2e98a8 -[UIWindowScene _computeMetrics:] 21 UIKitCore 0x270350 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:actions:completion:] 22 UIKitCore 0x1b2340 _UISceneSettingsDiffActionPerformChangesWithTransitionContext And two full logs: On iPadOS 15 On iPadOS 14