It suffices to add

App()->getPluginManager()->dispatchEvent($oEvent);

after line 265 at the file. Currently wondering how to make a pull request in GitHub...

Good catch. Github has lots of documentation on how to do a pull request. Join us on telegram if you need guidance.

If I got it right this time, then the fix is at https://github.com/LimeSurvey/LimeSurvey/pull/1593 and I guess you will get a notification of a pull request after some automatic checks are done.

Telegram? More info on that is available at [please make a www-page if not already exists]?

Since it's merged, i think it's OK ?
Can you confirm ?

PS : i update the event in https://github.com/LimeSurvey/LimeSurvey/pull/1593/files

        $oEvent = new \LimeSurvey\PluginManager\PluginEvent('beforePermissionSetSave');
        $oEvent->set('aNewPermissions', $aFilteredPermissions);
        $oEvent->set('iSurveyID', $iEntityID);
        $oEvent->set('entity', $sEntityName); /* New in 4.X.X */
        $oEvent->set('entityId', $iEntityID); /* New in 4.X.X */
        $oEvent->set('iUserID', $iUserID);
        App()->getPluginManager()->dispatchEvent($oEvent);

entity and entity added …

Since it's merged, i think it's OK ?

Yes, it's OK.

Thank you !

fixed in 4.4.0 rc1