Dann melde das doch bitte als Wunsch an Samsung, vielleicht verbessern die dann dort etwas. Und Deine Jahrestage müssten eigentlich unter Erinnerungen zu finden sein. Und diese einfach als Wiederholung einstellen.
I have no such issues with the samsung calender app. On the opposite, my workplace iPhone cal app is c**p. it can't handle meeting invitations, doesn't show the invitation text.
the samsung calender app can be greatly configured. try to find what calenders are shown. the anniversary calender is probably switched off.
the issue i have is that anniversaries are shown double. one entry comes from the Microsoft calender, the other from samsung contacts birthday info
https://galaxystore.samsung.com/detail/com.svprdga.birthdays is my recommendation for birthday and anniversary reminders. It is free with ads. But I have set it to use the wifi network only, which I'm not using most of the time . As I am using a mobile network, the ads are not shown. The app is working fine with me on Galaxy a33 5g mobile phone. Greetings from cologne