Tabbar position not work in iOS 14

Hi.
First of all, thanks for made LimberTabbar.iOS.

in iOS 14, tabbar position not work.

code
self.tabBarController?.tabBar.frame.origin.y = UIScreen.main.bounds.size.height

iOS 13 and older, tabbar will move to y. But iOS 14 not work.

====
addition code
UIView.animate(withDuration: 0.3) {
self.tabBarController?.tabBar.frame.origin.y = UIScreen.main.bounds.size.height
}

iOS 13 and older, tabbar will move to y with animation.
iOS 14, tabbar pop to middle of screen and move to bottom with animation.

This occur with sample project too.