You can achieve this scenario by using the combo box control instead of the drop down.
If you configure a combo box to disable searching (IsSearchable = false) and to be single-select (SelectMultiple = false) it should be fairly similar to a dropdown, with the advantage of being able to click on an "x" of the selected item pill to remove that item and have a blank selection.
We are planning to replace the dropdown implementation with that of a combo box, so that's the reason why this fix isn't being prioritized.