Adding an event in any calendar changes my status to On Holiday

I have Discourse Calendar installed and it has worked fine. However, I just noticed that any calendar now acts as a Holiday Calendar. I tried setting the holiday calendar topic id already

However, adding an event to any calendar still sets my holiday status

CleanShot 2023-01-05 at 21.15.40

So effectively, all calendars are holiday calendars now :eyes:

Is this a bug or is there a configuration setting I missed?