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This change fixes the problem when header update would get triggered while the header config subviews are not yet fully unmounted. The root cause of this problem is kind of a mystery, I encouneter a crash when going back using back button from a screen that have custom back button image rendered. Turned out that after implementing removeAll schema the problem no longer occurs. I didn't have enough time to investigate it further but supporting removeAll schema is an improvement regardless so going with this solution for now.