Your response covers the “Eligibility Test” for maximum exclusion of gain on the below link but doesn't address the “facts and circumstances” test regarding multiple homes.
The “facts and circumstances” test could be interpreted that not only do you I need to have lived in the home for 2 out of the last 5 years, but that I might have to pay capital gains tax if I update my address (drivers license, mailing address, etc.) to the new home before closing on the home I've lived in for 3 years and don't live there anymore since you can only own one main/primary/principle home at a time.
The explanation is not clear and vague on the below IRS link "The more of these factors that are true of a home, the more likely that it is your main home." Both homes are also near where I bank or go to recreational clubs. I have spoken with someone in the real estate industry, and they said they haven't heard of people in similar situations being forced into capital gains taxes over an address change, but I don't want to be the first.
https://www.irs.gov/publications/p523#:~:text=If%20you%20own%20and%20live,factors%20are%20relevant%2....
