Help with Italy Train Purchasing

Can someone please tell me if the high speed trains don’t run on Wednesday or Thursday for trains from Venice to Florence?

I am trying to pre book my tickets and have been waiting for them to load for like the past 2 months checking almost daily for my date (July 29, 2026) and they are not popping up but dates after them are.

I tried to book on both www.italotreno.com and www.trenitalia.com. If you check on those sites from Venezia S. Lucia to Firenze S. M. Novella, it’ll show it doesn’t have any trains on italoreno and only the 4 hour train on trenitalia and not the 2 hour fast trains but on the 31st it has trains. See the images below.

Appreciate the help in advance!