Can't delete diary items in IOS 11

Since installing IOS 11 on my phone and tablet yesterday, I'm unable to delete items from the diary. Swiping an item from right to left does nothing - the delete option does not appear. (The left to right swipe still works, and brings up the copy / paste actions menu). The problem occurs on both devices, an iPhone 7 and iPad Air 2.

I apparently have to use the browser on my laptop to delete items, which is a pain.

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