Event not displayed despite created

[ronpub]

Issue:
I create an event on a caldav network calendar in Thunderbird. I click save&close.
The event is not displayed in the calendar in Thunderbird.
But it is sync and displayed on any other app connected to the caldav calendar (Synology, Android, ...)

Thunderbird 91.10

[WaltS48]

What network?

My newly created events display in my Google calendar immediately upon creation, using 91.10.0, 102.0b1 or 101.0a1. Depending on which version I may be using at the time.

[ronpub]

The network is synology caldav on DSM 6.2.4.

I don't know if I make it clear that my events created in Thunderbierd are not displayed in Thunderbird. But only on synced devices.

[WaltS48]

I hope a user with a working synology caldav on DSM 6.24 that displays events in Thunderbird appears to assist you.

[mgagnonlv]

I have noticed it a few times recently. My calendars are all on Google.

It seems to be a "refresh" bug, because switching one or two months forward and back seems to solve the issue. Still annoying, though.

[ronpub]

Unfortunately the tip to refresh doesn't work for me. And for me it is all the time.
I don't know very much about the caldav protocol. I wouldn't at first thought the caldav server is the issue as the events are created in Thunderbird. But I will ask then on synology forums. Thank you.
And I'm a degoogler then no google calendar for me.