Keep in mind, most of the worry about them not letting you in is related to some information we had about a year ago that some people were not being let back in (plus an occasional anecdote over the years where people have had problems, but very few and far between). In fact, while there were maybe one or two "gringos" (I use the term loosely mostly to denote expats from non-SA countries like US, Canada, Europe, etc) that were involved in the problem, the two "high-profile" cases were from other Latin countries in this hemisphere (the DR was one, and it seems like Peru or maybe Colombia was the other?).
I don't think you'll have any problems whatsoever, except having to spend time and money to do something that you already know you shouldn't have to do, given your status.
Having said all of that, there is always a very, very, very slight possibility that they may initiate some kind of immigrations case against you. As I understand things (from bajo_cero's posts more than a year ago related to this) in order for them to actually keep you from entering on your return trip, the immigrations officials have to initiate a complaint to an immigrations judge, and that judge can issue an order to you that you have 30 days to regularize your immigrations status. The paper will be sent to the address you declare on your immigrations forms when entering Argentina. If you don't regularize your status within 30 days of the issuance of the letter, the next time you leave and try to re-enter, you could (or probably "would") be stopped and not allowed to enter.
I think it is a near-zero % chance that you have already been issued such a letter because you seem to be recently doing this, as well as having visited immigrations for an extension, so the worst case scenario is you might get issued the letter for regularization after this trip, but it's so highly unlikely that would happen that I wouldn't worry about that either.
I don't think you'll have any problems whatsoever, except having to spend time and money to do something that you already know you shouldn't have to do, given your status.
Having said all of that, there is always a very, very, very slight possibility that they may initiate some kind of immigrations case against you. As I understand things (from bajo_cero's posts more than a year ago related to this) in order for them to actually keep you from entering on your return trip, the immigrations officials have to initiate a complaint to an immigrations judge, and that judge can issue an order to you that you have 30 days to regularize your immigrations status. The paper will be sent to the address you declare on your immigrations forms when entering Argentina. If you don't regularize your status within 30 days of the issuance of the letter, the next time you leave and try to re-enter, you could (or probably "would") be stopped and not allowed to enter.
I think it is a near-zero % chance that you have already been issued such a letter because you seem to be recently doing this, as well as having visited immigrations for an extension, so the worst case scenario is you might get issued the letter for regularization after this trip, but it's so highly unlikely that would happen that I wouldn't worry about that either.