Why is the number not edited in the inputmask when an invalid number is entered?

Question

JavaScript

There is an example that uses an inputmask. I can’t edit the number if it’s not valid

. I understand that the problem lies here

$('input[name="leyka_donor_phone"]').on("focus click countrychange", function(e, countryData) {

            var pl = $(this).attr('placeholder') + '';
            var res = pl.replace( /X/g ,'9');
            if(res != 'undefined'){
                $(this).inputmask(res, {placeholder: "X", clearMaskOnLostFocus: true});
            }
        });