Flight Ticket mail doesnt add apple calendar

Hi everyone,

I have an Apple ID opened with a Gmail account. I use the Gmail application on my iPhone. My flight ticket emails coming to my Gmail are not processed in the Apple Calendar. However, if a meeting is created and comes to my email, it is processed in the calendar. The first ticket I bought from Pegasus was processed but I have no idea how. After 7-8 hours, it was processed automatically when I opened and closed the calendar settings. However, my new tickets are not added to the calendar. I also contacted Apple support, they connected to my phone and checked the settings, but no results were obtained. It is very strange that the first tickets were added but the tickets I bought later were not processed. If anyone has an idea, can you write?