Pre- and Post-publish notifications not triggered from ExtendScript

I am having a problem with FrameMaker 2020 and notifications in ExtendScript. If I have this code in my startup folder:

Notification (Constants.FA_Note_PrePublishDitamap, true);
Notification (Constants.FA_Note_PostPublishDitamap, true);

function Notify (note, object, sparam, iparam) {
    switch (note) {
        case Constants.FA_Note_PrePublishDitamap:
            alert ("1. In FA_Note_PrePublishDitamap event.");
            break;           

        case Constants.FA_Note_PostPublishDitamap:
            alert ("2. In FA_Note_PostPublishDitamap event.");
            break;
    }
}

I save a ditamap as a FrameMaker book with components, both events are triggered and I see the alerts. However, when I save the ditamap from ExtendScript, the events are not triggered. This is the code I am using to save the ditamap:

function saveMapAsFmBook (map, ditaval) {      

    var params, returnParams, i, saveName, book;

    saveName = map.Name.replace (/\.[^\.]+$/, ".book");
    params = GetSaveDefaultParams ();
    returnParams = new PropVals ();

    i = GetPropIndex (params, Constants.FS_FileType);
    params[i].propVal.ival = Constants.FV_SaveFmtBookWithFm;
    i = GetPropIndex (params, Constants.FS_AutoBackupOnSave);
    params[i].propVal.ival = Constants.FV_SaveNoAutoBackup;
    i = GetPropIndex (params, Constants.FS_FileIsInUse);
    params[i].propVal.ival = Constants.FV_ResetLockAndContinue;
    i = GetPropIndex (params, Constants.FS_ShowProgressBar);
    params[i].propVal.ival = Constants.FV_DoYes;
    i = GetPropIndex (params, Constants.FS_DontNotifyAPIClients);
    params[i].propVal.ival = false;
    if (ditaval) {
        i = GetPropIndex (params, Constants.FS_DitavalFile);
        params[i].propVal.sval = ditaval;
    }

    book = map.Save (saveName, params, returnParams);
    if ((book) && (book.Name)) {
        return book;
    }
}

Should the notifications get triggered when the save is called from a script?