Yes, multiple times this year, and I was out of the country when I was tagged in this post, hence the delay in response.
You remain a lawful permanent resident, despite the prevailing media and idiot scaremongering that prevails, and nothing whatsoever in law has changed that affects you in your present situation.
As you have filed a new I-751, when you receive the new receipt, note that that new receipt extends the validity of your expiry date of your card by 48 months from the card expiry date, and not by 48 months from the receipt date of the extension letter, so the latest your expired card be used with a current I-751 filing receipt for re-entry, will be 48 months from that expiry date.
Check & note down your dates very carefully, and continue to use the new extension letter in conjunction with the expired card for as long as you can.
After that it is stamp city, which comes with the hassle of 1) renewing the stamp every year, which, and I'm not going to lie, is a pain, and 2) a quick visit to secondary every time you re-enter the US to verify, which isn't bad and is efficient, procedural, and cordial. Honestly, even re-entering during the shutdown, the permanent resident line was a fairly grumbly 30 mins to get through, yet secondary was still just 5 mins. I have never waited more than a couple of mins at secondary for verification, usually when a US citizen or a minor is in there, as they get put to the front of the line before permanent residents, and permanent residents get seen before visitors/others.
Given it is just a couple of piece of paper it wouldn't hurt to travel with your I-290B receipts, and your prior receipt and denial letter, given that it does't take much space, but there is no need to produce them really at any time as it'll just confuse things, just stick to the main current I-751 receipt and you are golden. I used to travel with a whole host of prior paperwork, and now I don't, but you do you.
Once you have that refiled I-751 receipt, you are unambiguously in status as long as you have the expired card and new receipt/extension with you. Use that for travel and just eave the I290B to rumble along in the background.