Deleted events in google calendar are not refreshed

[supeters]

Describe the bug
I deleted a event in the google calendar - but it does not refresh in the day planner

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Expected behavior
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[puchasa]

I have the same issue on outlook calendar and I think I know what the problem is: Recurring events where only a certain event but not the entire series was removed from the calendar.

Tests that led me to this conclusion:

• Does not seem to be a problem with the (day planner plugin's) cache: I downloaded the plugin and imported the calendar today and events that were already canceled still show up in obsidian. (could technically still be calendar cache making problems).
• Created and removed an event from my calendar. Showed up and disappeared as expected (and with remarkably little delay!).
• Created a recurring event and removed one occurence: Recurring AND removed events shows up. All events disappear when I delete the recurring event series.

It is important to note that my outlook calendar on both desktop applications, mobile apps and web interface do NOT share this issue.

Additional information: I believe the behaviour persists no matter whether you or others have created the series (this i have confirmed) and no matter whether the organizer has cancelled an occurence or you personally have declined a specific occurence (I'm pretty sure I have examples of both in my calendar, but I have not tested (because I'm not messing with coworkers' calendars)).
Just for the sake of it I also attempted to import my calendar via this (#395) method instead. Same issue.