Here is a plugin I wrote to cancel or release reviewed app store version, might help for those who encounter the same situation.
you can call this plugin action before Deliver.
https://github.com/andrew54068/fastlane-plugin-taiwan_number_one
kidnapper
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It might be late for this, but I believe it's due to the toolbar's isTranslucent property been set to false. Switch it to true should solve that problem.