You won't get "change" events when the hidden element is changed programatically by somebody's JavaScript code. Those are only generated by the browser when there's actually user action. What would be better would be for the 3rd-party JavaScript to explicitly call ".change()" (the jQuery method) on the hidden select.
Input-country' is not a valid selector. Further, the change event requires focus gain, value change, focus loss (blur)--hidden inputs will not have such a sequence of events, so you must manually trigger change on them when you change their values.
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