Created attachment 142791 [details]
View of Korganizer

SUMMARY
I have some google calendars and some events from it aren't displayed at all in both Korganizer and Kalenar apps. Because the issue is in both those frontend apps I think that issue can be in Akonadi backend really. But maybe I'm wrong.

The even which I can't see was created by someone else and I was invited to it. I accepted the invitation and in google calendar I can see it with color as it is in my calendar now. But in Korganizer/Kalendar apps I can't see it at all.
The strange thing is that other, similar events, accepted by me in the same way I can see in the Korganizer and Kalendar apps. So it's not the issue for all such events.

There is also other type of events which aren't displayed in Korganizer/Kalendar but for those events the issue is permanent, so none of such events are displayed. The events are invitations which I didn't accepted yet (white background in the Google calendar) and event's which I say that I will "maybe" attend.


SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.1
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.13-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz
Memory: 62,5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630

ADDITIONAL INFORMATION
In attachement I added screenshots with what I see in the Korganizer, Kalendar and Google calendar page for the same week and same calendar. I hope that it will be more clear with those screenshots.