I actually get that on iOS 10.
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I'll pass along a trick that has worked now everytime I've had to use it (3x): go to your regional settings and change your language and then change it back (I switch from U.S. English to Canadian English and back again). Has worked each time to repopulate the widgets.
Even if you think Apple is aware, report it anyway. If everyone assumes Apple knows or that someone else will report something, we run the risk of something not getting fixed.