In order to reproduce the failure just use the showcase for the autocomplete where the functionality for selecting several items is shown. First type 'Al' and select 'Alabama'. Then type comma and then 'Ca' and select 'California' with the mouse by clicking on the 'California' item. Then 'Alabama' is replaced with 'California'. If you use ENTER key or RIGHT ARROW key to select 'California' then it works. It is always the first item in the list that is overridden with the last selected item. Strange!!!