I'm having a bit of trouble thinking of a good way to describe/search for this, so bear with me if it's a duplicate.
I recently realised that in the iOS app, when you click a link and a page is opened in the included browser, apart from closing the browser by hitting the “OK” button at the top (which is not always visible), swiping from left to right to ‘go back’ has the same effect.
However, when I close the browser in this manner, the question that I return to remains frozen for about five seconds, and even after it unfreezes, the “<” button to return to the previous question or question list does not work. It looks normal, but when I click on it, it changes to being greyed out and does nothing.
If I close the browser with the “OK” button, this does not happen: the question does not freeze, and the “<” button works as it should.
Is this a known bug?
(iOS 9.2.1, up to date; SE app version 220.127.116.11.)