Back in 2018, my wife had her N400 interview with her I751 pending. She was called to the N400 interview, I went with her, and the IO requested I come back as well and conducted a short combo interview and asked if we had any additional information to add to the package so we added updated tax filing copies. My wife got the same slip about her N400, but a few days later we got the NOA of the I751 being approved, and the N400 “oath to be scheduled” message. Of course many things have changed since 2018, but hopefully you will hear good news soon.
Good Luck!