Inserting past events in local calendar

I can’t seem to get past events inserted into a simple local calendar. My use-case is just birthdays. I thought it’d be neat to have each birthday, being a yearly-recurring event, start at the birth year of each person. But entering a date in the past for the “start” field doesn’t do anything. I can select a past date, but then when I press OK the field doesn’t change value.

At first I though it’s not possible to select a date “very far” into the past, like 1977, but even a more recent past date like 2016 is not accepted. Last week, a few months ago, that all works fine. But even 2024 is not being accepted. The field just won’t change value.

Is this a bug? Feels like it, if even 2024 is not allowed.

It does seem to be a frontend bug. Local Calendar does not have an issue with very old events if they are added directly to the ics file.