2020 Return Disappeared from IRS System After Acceptance - Transcript Shows Asterisk (*) After Household Employee Letter

Filed 2020 taxes early 2021 and saw it processing for months. Got letter about household employee estimated payments in July, responded immediately. Now IRS shows no record of return at all. Can't reach anyone on phone and no IRS office nearby. I'm looking at my transcript availability and it's really strange. According to the IRS website, I have: Return Transcript: - 2021: Available - 2020: Shows with an asterisk (*) - 2019: Available Record of Account Transcript: - 2021: Available - 2020: N/A - 2019: Available Account Transcript: - 2022: Available - 2021: Available - 2020: Available - 2019: Available - 2018: Available Wage & Income Transcript: - 2022: N/A - 2021: Available - 2020: N/A - 2019: N/A The weird thing is I see that asterisk next to 2020 for Return Transcript, but N/A for Record of Account Transcript for 2020. And I definitely filed my 2020 taxes in early 2021. I watched it in the processing status for months on the Where's My Refund tool. Then in July 2021, I received that letter about household employee estimated payments. I responded to it right away with all the documentation they requested. But now when I call, they say they have no record of my 2020 return at all! How is that possible? I've tried calling the IRS dozens of times but can't get through to anyone. I've tried making an appointment at an IRS office but there's nothing within 100 miles of me. What should I do since my return was definitely accepted (I even have the acceptance confirmation) but now shows as non-existent in their system? The transcript page shows something weird with that asterisk. Does that indicate some kind of problem?