NotFoundError 404: DELETE /rest/tutanota/calendarevent

[bedhub]

Describe the bug
After log in and during the synchronization process i receive an unexpected error for a DELETE request to an calendar event.

I checked the error reporting and there are a several reports each day.

By looking closer at my case i noticed that the event the we try to delete is part of an external calendar subscription.

To Reproduce
Steps to reproduce the behavior:

1. Subscribe to calendar via URL and have at least one event inside it.
2. Have two clients with offline data that have this event in the offline database (e.g. mobile app and desktop client)
3. Log out of both clients.
4. Delete the event from the external calendar
5. Login with client A (mobile app) and synchronize the external calendar so the events gets removed from the tuta server
6. Login with client B (desktop client) => see unexpected error.

Notes
To easier reproduce this case it is recommended to modify the MailLocator in a way that the synchronization of external calendars is executed always after login ( force=true).

async handleExternalSync() {
		const calendarModel = await locator.calendarModel()

		if (isApp() || isDesktop()) {
			calendarModel.syncExternalC

Expected behavior
Synchronization happens without error

Error Report

Error message:
404: | DELETE /rest/tutanota/calendarevent/ODpM5ZF--B-9/MTcyNzYzODcxMDMyOA
Stacktrace:
dv@asset://app/common-min-BA8onQK2.js:1:13964
@asset://app/calendar-worker.js:23:17958
App version:
259.241217.1
Client type:
Ios
Additional info:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)

[vascYT]

Thanks for reporting this, I also experience this issue 👍