A number dont race…there was a thread on this some time ago.
Depending on how you ride and what efforts you are doing you may not actually push your limits or your power to trigger even a bump in FTP based on the modeling done by say Xert or Intervals.icu.
My group rides are not hard rides. So I can do a couple of SSB rides and a group ride in a week and rarely go above my FTP. Rides may be long in duration but not result in a sustainable effort above FTP that would necessarily model a bump in FTP.
My own riding this year had such a period. Intervals.icu had me declining in FTP. Lots of long rides. Good effort but steady and not over FTP. You could track the changes in my heart rate and power and see the improvement. It wasnt until I did an FTP test that intervals.icu showed the increase which was above previous FTP. The models are reactive to how hard we ride. They do not project what our FTP will be based on are riding.