Thank you for the feedback, @AldridgePrior!
Let’s dive in a little deeper to clarify some things. 
AI FTP Detection
AI FTP Detection will show after any workout when available, whether or not an athlete is using a training plan. It will show “early” if they successfully complete a Level 9 or greater in Sweet Spot, Threshold, VO2 Max, or Anaerobic workout.
FTP Adjustment During the Specialty Phase of a TR Training Plan
AI FTP Detection will not run during the Specialty phase. Adaptive Training may however make an FTP adjustment. FTP adjustments are triggered if your Progression Levels surpass a level nine in the Sweet Spot, Threshold, VO2, or Anaerobic zone. An FTP adjustment will also be triggered if any one of your Progression Levels is lowered below level two. These Progression Level changes during the Specialty phase will result in a 2% FTP adjustment.
Decrease in FTP
Regarding the AI FTP Detection decrease you received on December 26, 2023, of 8 watts, by looking at your Calendar, I have a feeling it was because of your training pattern before it. I can see you took almost 2 weeks off in November and weren’t as consistent with your workouts as you were in October.
Keep in mind this decrease is not massive and will probably ramp back up with consistency.
If you want to increase your FTP, I would recommend creating a training plan with Plan Builder or manually entering each training phase to follow a natural progression of Base, Build, and Specialty. This way, you can ensure you’re working the correct energy systems in a progression that sustains and builds FTP.
Note: your FTP is already pretty high, so as you normally “peak” your FTP, the gains will be naturally smaller.
Here is more info on how to build your FTP: