Why does handlebar not appear consistently in the native iOS UI design?

Handlebars usually appear at the top of Modal View:
iOS screenshot with a handlebar at the top

But in other system-level views, there is no handlebar, even if they functionally act like a Modal View. (For instance, this screen, where you can choose devices to send a photo by AirDrop, is definitely a modal task. But the view does not have a handlebar.)
Airdrop screen without handlebar

Does anyone know the reason for the difference behind these two designs?

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