yii.activeForm and jquery onSubmit for this form. Do not call twice.

myform.js

    $('.feedback-form__form').on('submit', (function (e) {
        // first time call before first call  yii.activeForm submitForm
        // set $.Deferred() in submitForm ()
        // second time call before second call yii.activeForm submitForm
        // note: fire submit again after ajax
        // don't call form twice - js validate already is true
        console.log('feedback-form__form submit');

        let $form = $(this),
            submitButton = $('input[type="submit"]', $form),
            data = $form.data('yiiActiveForm'),
            promiseReady = false,
            sendAjaxRequest = function () {
                console.log('sendAjaxRequest : true+false or $.when($form.data(\'yiiSubmitFinalizePromise\')).done');
                promiseReady = false;
                let url = $form.attr('action'),
                    formData = new FormData($form[0]),
                    feedbackFormSuccess = function (data) {
                        console.log('feedbackFormSuccess');
                        if (data.success) {
                            console.log('data.success');
                            $('.feedback__result', $form.parent('.modal-body')).text(data.success).addClass('feedback__result--success').removeClass('hide');
                            $form.yiiActiveForm('resetForm');
                            $form[0].reset();
                        } else {
                            console.log('!data.success');
                            $form.yiiActiveForm('updateMessages', data.messages);
                        }
                        data.validated = false;
                        console.log('data.validated ' + data.validated);
                        submitButton.attr('disabled', false);
                    },
                    feedbackFormError = function (data) {
                        console.log('feedbackFormError');
                        let responseJSON = data.responseJSON;
                        if (responseJSON.message) {
                            $('.feedback__result', $form.parent('.modal-body')).text(responseJSON.message).addClass('feedback__result--error').removeClass('hide');
                        }
                        submitButton.attr('disabled', false);
                    };
                $.ajax({
                    type: 'POST',
                    url: url,
                    data: formData,
                    cache: false,
                    contentType: false,
                    processData: false,
                    success: feedbackFormSuccess,
                    error: feedbackFormError
                });
            }
        ;
        console.log('data.validated ' + data.validated);
        console.log('data.submitting ' + data.submitting);
        console.log('$form.data(yiiSubmitFinalizePromise) ' + $form.data('yiiSubmitFinalizePromise'));

        if (data.validated && !data.submitting) {
            // no not call twice in this case
            sendAjaxRequest();
        } else {
            if ($form.data('yiiSubmitFinalizePromise') && !promiseReady) {
                promiseReady = true;
                $.when($form.data('yiiSubmitFinalizePromise')).done(sendAjaxRequest);
            }
        }

        // cleaning previous send result
        $('.feedback__result', $form.parent('.modal-body')).text('').addClass('hide').removeClass('feedback__result--error').removeClass('feedback__result--success');
        e.preventDefault();
        // disable submit
        submitButton.attr('disabled', true);
    }));