At one point in my survey (using anonymous links), respondents are redirected out to an external website to complete a task, then redirected back to the survey upon completion:

Qualtrics.SurveyEngine.addOnload(function() {
   var taskStatus = "${e://Field/taskStatus}"
   if(taskStatus == "0") {
        var taskStatus = 1
        Qualtrics.SurveyEngine.setEmbeddedData("taskStatus",taskStatus);
        var targetURL="${e://Field/baseURL}"+"${e://Field/outURL}"
        window.location.replace(targetURL);
   } else {
        this.clickNextButton();
   }
});

For any browser in Windows, the redirect happens correctly. When the respondent is returned to the survey, ${e://Field/taskStatus} = 1 and they are sent to the next question.

For any browser in iOS/MacOS, the redirect happens correctly. When the respondent is returned to the survey, ${e://Field/taskStatus} = 0 and they are redirected back to the task.

How should I get ${e://Field/taskStatus} to consistently equal 1 upon return?