There is a "Blocker Review Meeting" in our calendar:
https://apps.fedoraproject.org/calendar/QA/

This week I edited it and changed its timezone from UTC to America/New_York. I adjusted the whole series this way. Everything seemed to work correctly.

However, the next day I've found out that Blocker Review Meeting disappeared from my Google Calendar. It was there before, now it's gone, it's not even showing in the past.

I can see all other QA meetings just fine, just the Blocker Bug Meeting is gone.

I downloaded the ics file and imported it into Evolution, and it looks OK there. So it's a problem that probably affects only certain clients.