Entity reference select fields do not update properly

Here's the form data for the two types.

Autocomplete:

field_name
  widget
  0
  	target_id
  		value

Select:

field_name
  widget
    #key_column => target_id
    value	  		 

I tracked this down to a mismatch in the default_value_input and form input values. (See attached screenshot).

This patch fixed it for me, but I suspect there may be a better fix, perhaps in this part of `buildForm`:

              else {
                // TODO
                // I cannot figure out how to get a form element for only a
                // field. Maybe someone else can.
                // TODO Doing it this way does not allow for feild labels on
                // textarea widgets.
                $form[$field_name] = $entity->get($field_name)->defaultValuesForm($temp_form_element, $temp_form_state);
              }

Other parts of this IF/ELSE set the field value, but know what widget they are targetting

$form['default_value_input'][$field_name] = ....