v3.46.x "The calendar backend servicing <x> has quit unexpectedly."
After update to evolution-data-server-3.46.2 and evolution-3.46.2, from 3.44.4, I am seeing periodic (several hours to 2 days after evolution restart) mass crash of calendar service. All calendars on the system crash at once, with "The calendar backend servicing has quit unexpectedly." notified for each. Most of them are CalDAV instances associated with Radicale 3.1.8 on the server side, but 2 of them are local built-ins, e.g. "Personal" and "Birthdays & Anniversaries", and all (100%) calendars show the red-circle-with-white-line connection failure icon in the Calendar view on evolution.
I see from the change log that 3.46 added support for HTTP/2 in CalDAV connections. That seems like the first place to look for a regression.
Logs and monitoring show no problems with Radicale, though it is probably worth noting that Radicale does not support HTTP/2.