I have a page where a dropdown triggers a data refresh that provides the list for the DropDown Tags widget, on the most recent version (2.6.12) of the OutSystem UI module the DropDown tag widget keeps the original items & adds the new items to the list instead of clearing the list & only showing the new items.

Attached is a sample module that shows the setup, by changing the version of OutSystem UI module and refreshing dependencies I'm able to recreate the working & broken versions of my workflow. 

The issue appears to be the removal of elementId.options.length = 0 from the OnDestroy action. I merged it back in while keeping the other changes as follows. This workaround appears to be working correctly in my testing.

var elementId = document.getElementById($parameters.ElementId);

$parameters.ChoicesObj.destroy();

$parameters.RTLObserverObj.disconnect();

// If element exists after detroy, set length to 0

if(elementId) {

    elementId.options.length = 0;

}