How to make combobox revert when user input does not match items in store?

I have a combobox with the following configs:

queryMode: 'remote',

forceSelection: true,

editable: true,

autoSelect: true

the following configs are data bound:

store,

value,

selection,

emptyText

if the user types a value into the field that does not match something in the store and loses focus, the box clears. I would like for the box to revert to the last valid selection in this case. Is there a config I am not setting or anything I can do to make the box display the last valid selection?

How to make combobox revert when user input does not match items in store?