Tapping multiple collection view cells at once doesn't trigger @(setSelected:) so a lingering background fade will not fade out.

[bfeher]

When a tap is recorded, a background fade fades in. If it is set to linger, it does not get removed until setSelected:NO is called. So when a user taps multiple cells simultaneously, setSelected:NO does not get called by the OS and the background does not fade away as it should.