Calendar: frequest occuring event, but sign only one single event to another calendar not possible?

Hi there,
i made a frequently occuring event. Say, every day from 8pm-12pm, calender name: team.
Then I would like to change only one single event (say Monday, 24th of November) to another calender (calendar name: John). I change the event to calendar John and save with the button “change only this occurance”.
Unluckily every occuring event will be changed to calender John, but should stay with calendar team.
Bug or feature?
Thanks for help