datepicker updating drop-down values fails when no day is clicked

datepicker updating drop-down values fails when no day is clicked

On  https://jqueryui.com/datepicker/#dropdown-month-year , if you select a date first, then exit the picker and re-enter and now change just the year (or month) via the drop-down the input field doesn't get updated.
I believe the user expectation is that any changes done in the calendar are reflected in the input field once the pop-up is gone, ie we don't have to 
explicitly  click the (same) day again if we just want to change day/month.

I also tried adding the "done" button  - same result. 

Tested in Chrome and MSIE and both exhibited the same behavior.

Does anybody have a work-around for this?