User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:92.0) Gecko/20100101 Firefox/92.0

Steps to reproduce:

I set all my group calendars to read-only so that I don't create entries by default. After the last update from:
Upgrade thunderbird-91.1.0-1.fc34.x86_64 @updates
Upgraded thunderbird-78.11.0-1.fc34.x86_64 @@System
Upgrade thunderbird-librnp-rnp-91.1.0-1.fc34.x86_64 @updates
Upgraded thunderbird-librnp-rnp-78.11.0-1.fc34.x86_64 @@System
all the calendars are not marked read-only anymore. Trying to set them back to read-only works but the lock disappears after a restart of Thunderbird.

Actual results:

Read-only status of calendars isn't persistent and disappears after each restart.

I see for less than one second that the lock is still there and then it disappears.

Expected results:

Read-only status remains until I decide otherwise...