Don't get alert for recurring calendar events since IOS 18

Hello all,

since I updated my iPhone 14 Pro to IOS 18, I have the problem that I don't get a notification for recurring events that happen every day, f. ex. my medicine reminder. I also have this problem on my iPhone 11 on IOS18. At first, only some of the normal entries wouldn't appear but now, I can't get a notification for any recurring event. For normal events, everything works fine. All the recurring ones have the alert set to notify when event starts.

Does anybody of you have this problem or knows a solution to this? Very annoying.

Thanks in advance,

Markus