colorid not changing the event color

[thokkane]

I have this code with the colorId set, but it seems not have any effect. Everything else is working, but the color is not set. Also when updating the event it always sets the color to the default and overwrites if the event color was changed by a user in google calendar. Am i missing something for the colorId parameter? I've tried to leave it completely out to not overwite user's color changes, but even then it resets the color to the default, overriding the user's changes.

let event = {
    'start': { 'dateTime': start_date },
    'end': { 'dateTime': end_date },
    'location': location,
    'summary': summary,
    //'status': 'confirmed',
    'description': description,
    'colorId': 5 
}
resp = await cal.Events.insert(calendarId, event)