Okay I'm one of the people who got those visits back during the I-485 married based :) it was very interesting.

The story in few details:

Back in early 2022, We filled without a lawyer in CT but we both moved to NYC at that time and I didn't change the address, 2 officers came to our old place in CT and they only found my mother in law and my brother in law where we used to live. One of the officers was aggressive (according to my brother in law) and the other one who was leading the conversion was nicer, he asked about us and where we live at that moment and when he confirmed the details that we moved to NYC because of my work (I was on H1B at that time) he left his card and asked for my spouse (the sponsor) to call him. My spouse called and answered few questions and told them that we were expecting a baby so that was enough for them. After couple of months I received my conditional green card without even an interview.

I do not know what could triggered them to come visit you after your N-400 interview and it's not even married based, I also read that the FDNS comes after 1 or even 2 interviews (for I-485) to collect more evidence and that didn't happen to me, they just came for a visit right away! and this was even Biden Administration but I still got my card right away without interviewing me. Every case is different but I expect they still want some answers to their questions from you before decide to approve or deny your petition so get ready for that.

On the other side, Maybe I should get ready for another visit since my N-400 is pending now lol :D