Why wasn't Giorno in part 6?

I'm curious, can you explain why Giorno Giovanna wasn't featured in the sixth season of the anime series, 'JoJo's Bizarre Adventure'? Was there a particular reason behind this decision? Was it due to creative choices, scheduling conflicts, or perhaps some other factor that we're not aware of? It's quite intriguing to think about how his absence may have impacted the overall narrative of the season.