Calendar events not updated on remote changes from Google Calendar

[groszdaniel]

At least some remote changes to Google Calendar events do not show up upon syncing. The steps I did:

1. I created an event on my Android phone, which uses a Google calendar via DAVx⁵. (The calendar app is crDroid's default calendar app, Etar Calendar.) I added some reminders.
2. On my laptop, I added some more reminders from KOrganizer, which syncs with the same Google calendar. (I checked in the Google Calendar web interface that these new reminders were in fact added there.)
3. On my phone I tapped Refresh in Etar Calendar, and then also repeatedly manually synced the calendar in DAVx⁵ and tapped Refresh in Etar Calendar again. But the added reminders don't show up. (I also installed another calendar app, Fossify Calendar, to check if the bug is in DAVx⁵ or Etar Calendar, and the change doesn't show there either.)

I've also tried moving the event in KOrganizer, on my laptop, from the Google calendar to a local calendar (this deletes it from the Google calendar and creates it in the local calendar) and back again, in the hope that DAVx⁵ would see it as a new event, and import all data anew. Instead, after moving it to a local calendar in KOrganizer, I refreshed in DAVx⁵ and the calendar app, and the event disappeared, but when I moved it back and refreshed in DAVx⁵ and Etar Calendar again, it didn't show up at all. I guess some unique id was preserved when moving to a local calendar and back, and once DAVx⁵ has known about an event based on that id, it never syncs downwards any change to it?

[rfc2822]

Works without problems here. I didn't try with KOrganizer, but added multiple reminders directly in the Google Calendar, and then synced back to DAVx5 / Etar, and it worked fine.

So if you have a specific event that doesn't work (missing reminders), please provide the (anonymized) iCal or logs here so that I can try it (I don't have KOrganizer).