iOS 18.0.1, calendar search feature

Hi everybody! Formerly there used to be the possibility to do a quick search for a contact’s birthday date in the calendar app just by typing the name in the calendar search. Now after updating to iOS 18.0.1 this is no longer possible. Birthdays figure correctly in contacts AND in the calendar, hook is set to birthdays in iCloud, but no results when using calendar search. Other user describes same experience. Is it a bug? Or are there reasons why the feature could have been eliminated? Thanks for sharing