Steps to reproduce;
Pull down the screen on the question-listing page to open the search bar.
Type is "this is a really really really long search term"
Hit enter to submit the search query
Note how there is no top-bar, and the "Cancel" button which is normally next to the search box has disappeared.
... as opposed to the normal view of this. This leaves you unable to exit the search view, short of editing your search input to remove a few terms, such that the "Cancel" button slides back into view.