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We use a UIScrollView but manage our own virtualization and when fast scrolling kicks in tvOS adds a secret child to our UIScrollView of type _UIFocusFastScrollingIndexBarView and gives it focus. I don't see shouldUpdateFocus being called for when this happens so I can't stop it. This is wreaking havok with our input and virtualization systems.We've tried scrollView.indexDisplayMode = .alwaysHidden but that doesn't stop this.