For example on the HistoryAction (enwiki example) page. If I type 2018 in the input control, the first of january 2018 is selected in the dropdown. I expect to be able to hit enter to select this date. This doesn't work, it submits the form with an 'invalid' value / no date selected-value.
It's worse, I cannot type 2018 and then switch to the mouse either. I need to select the 2nd of january, clicking january 1st also results in an 'invalid value'/'no date selected'
This is 'slower' than using keyboard controls in the old style form. (As always, i'm testing with Safari)