Why does this code not work with a version of InDesign?

Hello everyone, I'm trying to understand why the code I attach works perfectly with InDesign 19.x and does not work with Indesign 20.x (see image)

Both versions of InDesign are on MacOS Ventura 13.7.5. Is it perhaps a bug in the latest version of InDesign?

Is it a bug in the latest version of InDesign or a stupid mistake of mine? Thanks to all.

Here is the code:

function createFolder(folder) {
    var script = "";
    script += "try\r";
    script += "do shell script \"mkdir \" & quote & item 1 of arguments & quote\r";
    script += "tell application id \"com.adobe.InDesign\"\r";
    script += "tell script args\r";
    script += "set value name \"success\" value \"true\"\r";
    script += "end tell\r";
    script += "end tell\r";
    script += "on error\r";
    script += "tell application id \"com.adobe.InDesign\"\r";
    script += "tell script args\r";
    script += "set value name \"success\" value \"false\"\r";
    script += "end tell\r";
    script += "end tell\r";
    script += "end try\r";
    app.doScript(script, ScriptLanguage.applescriptLanguage, Array(folder.fsName));
    if(app.scriptArgs.getValue('success') == "false") {
        return false;
    } else {
        return true;
    }
}

if(document.saved) {
     var file = new File(document.filePath + "/New folder");
} else {
     var file = new File("~/Documents/New folder");
}
var saveFile = file.saveDlg(
    "Create folder",
    "All files:*"
);
if(saveFile) {
    var folder = new Folder(saveFile.fullName);
    if(folder.exists) throw {
        message: "The folder '" + folder.name + "' already exists.",
        level: "Warning"
    };
    if(!createFolder(folder)) throw {
        message: "Error creating folder.",
        level: "Error"
     };
};