Date widget doesn't let you pick the date when typing a year into the text field.

Steps to reproduce:

1. Go to https://en.wikipedia.org/wiki/Special:Contributions (or any page with a date picker)
2. Click on a date picker with no date selected
3. Type "2020"
   
4. Click on 1 January
   • Expected: "1 Jan 2020" (2020-01-01) is selected in the date picker
   • Actual: no date selected
     

It works if you click on any other day shown on the calendar.

Originally reported at https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Please_unfuck_page_history (heh)