Rather than waiting until the week before your race to add an extra filler week, I would recommend adding an additional week between Build and Specialty. The nature of this week will depend on how you are feeling at the time.
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If you are feeling pretty fatigued at the conclusion of the Build Phase:
You could add a week of filler between Build and Specialty. Maybe that is just a week of Traditional Base to allow your fatigue to drop and really ready you for the Specialty Phase, or maybe a period of time where you ride outside for fun. This extra unloading can be beneficial for your ability to nail all of the workouts in Specialty
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If you’re feeling really good at the end of Build Week 7:
Then go ahead and give yourself an extra work week before starting your Week 8 Rest Week. You could simply repeat Week 7, or if that is a little too hard, maybe Week 6.
By doing it this way, the final weeks leading up to your race will be completely optimized, and that will lead to a more optimized race performance 