For my case, I did mention that the I751 was pending at the time of N400 application submission (6/30/2024). In about a month, I got the interview scheduled. Soon the fingerprint update part happened. I started preparing for my interview with my spouse. By mid August, I got I751 approved and I got the 10 years card. 1 week before my interview I got the letter for I 751 interview. The date and time of the interview was the same as the N400. We both went and as soon as the officer called us, I told him that we got two letters, especially I 751 interview. His reaction was, "Who sent you this?". I mean it came from the same USCIS office. He told me to not worry about it as I already had the 10 years card. However, we did prepare our documents in case of any confusion. The officer asked us to show latest property taxes, latest tax returns, latest paystubs, latest bank statements. He was surprised that we had everything that he asked for. He asked if those were the same which we uploaded. Then he asked me 6 questions, which I answered correctly. He asked my spouse about his prior marriage and divorce. But the conversation was with very friendly tone, nothing like grilling us. He did ask me to read a simple sentence and write a sentence. Then he kept updating a lot of things, and asked us if we were okay to attend the oath the same day. We took the opportunity and returned to the ceremony.
My advice would be to be prepared for both interviews. They know that the two applications do get mixed up and local offices might not have all the updates. But whatever the situation by the time you attend the interview, immediately inform them and answer and provide evidences as they ask. It is a process
Even if you have to wait additional days they would fix everything and you will have the good news. However, I do hope that things go smoothly for your case.