@Jan-Rienk - I think this is less a bug and more a known design choice/issue: instances of recurring task do not trigger the “task added to this project/my tasks” rules as we might expect. There are a few request threads on this, including this one:
I agree that it really doesn’t compute for me why this trigger would not be met. I believe Flowsana does view these are newly created/added tasks if you happen to use it.