Calendar event colors not syncing with Google Calendar after iOS 27 update

Prior to the change to IOS 27, my calendar worked just fine. I would color events, and that would sync perfectly with my Google calendar. Now, it doesn't. I have to set up different calendars for birthdays, work and other events. It worked perfectly before, why did you change it? If you don't change back, I'll use Google calendar instead of Apple. Who thought of doing this?