DateTimeInputWidget doesn't update CalendarWidget (with only date configured) with selected date after form is submitted.
Example: https://en.wikipedia.org/wiki/Special:NewFiles?user=&mediatype%5B%5D=3D&mediatype%5B%5D=AUDIO&mediatype%5B%5D=BITMAP&mediatype%5B%5D=ARCHIVE&mediatype%5B%5D=DRAWING&mediatype%5B%5D=EXECUTABLE&mediatype%5B%5D=OFFICE&mediatype%5B%5D=MULTIMEDIA&mediatype%5B%5D=TEXT&mediatype%5B%5D=UNKNOWN&mediatype%5B%5D=VIDEO&start=2019-01-08&end=2019-06-01&wpFormIdentifier=specialnewimages&limit=50&offset=
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https://en.wikipedia.org/wiki/Special:NewFiles now files DateInputWidget, which doesn't have this problem, so the example link no longer reproduces the issue. It's probably still valid though.