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Service Worker Not Worked by iOS 11.3 MobileSafari #6989
steps to reproduce
The equivalent problem on the instance I use was resolved by upgrade from 2.3.3 to 2.4.0, so I'm guessing that fix did the job. :)
I had some trouble forcing it to refresh, though, immediately after that upgrade. In a pinch you can delete the icon and recreate it and it should clear it up.