Outlook didn't find the correct day-data

Hello, I wanted to find entries for a specific birthday (June 30th) in different years from my Outlook calendar without having to scroll through the calendar month by month. So I entered the search query shown below in Calendar Search/Options/Search Tools.

To my surprise, despite the clear search argument "on June 30, 2022", several birthday hits are listed, where only the last one matches the search argument in terms of the day and month. I was only expecting the one specific entry from 2022. What's going wrong here?

Even if I enter e.g. "October 1st, 2024" in the calendar search field, I get 4 calendar entries as a search result in which the date I am looking for does not appear at all.

How I have to enter a date, I'm looking for, so that Outlook interprets and finds the search argument correctly?
Why don't work it like I did?

I would be very happy about helpful answers or, better yet, a correct program adjustment.

Kind regards

Wos21-MS