This may be intended behavior, but if it is I would appreciate an adjustment.

When I toggle on a colleague's calendar most of the past events on my own calendars change to the same color. This behavior seems a bit inconsistent (see attached screenshots) - most past events on my calendars change color, but not all.

I use the colleague calendar feature to keep my wife's calendar open all the time. This means my own past events are always changed to a single color. This is a bit inconvenient if I want to hop back into a past week to check what I did or when a certain meeting occurred. I have multiple calendars for multiple teams/projects, and the color coding is important for making a busy week more easily scannable at a quick glance.