hey, quick update, just in case someone will be in the same situation as we were here.
so a week ago we did call USCIS customer support, and we were supposed to get a call back from their Tier2 manager within 72H, but it never happened.
yesterday we called them again, didn’t get much info on our case particularly, but at least they gave an info that RFEs are often being issued automatically every month, since the first one.
we were told exactly the same thing, that we just need to wait and see is they do receive our package in the next month (since we have those extra 60 days on top of the deadline).
BUT miracle did happen and that same day, status changed to "Cancellation Notice for Request for Additional Evidence". So I guess they finally got to open our package yesterday (even though it was delivered 3 weeks ago) and cancelled a second RFE after that.