I’ve noticed in my yard that wether second blooms set fruit depends a lot on weather conditions which also affect the amount of Powdery Mildew or Anthracnose on the panicles. If rains hit your second bloom, you may not get as much fruit set on the second blooms but if weather conditions are ideal, say for example that the temperature and humidity are unfavorable for Powdery Mildew, the second bloom May set more fruit for a variety that is susceptible to Powdery Mildew.
I’ve noticed on my Maha Chanok that I often get secondary blooms and fruit set for an extended season.
Simon