Rated 5 out of 5 stars

Hooray, it's working again.
After updating to version 128.5.2, all the problems mentioned below have been resolved. Many thanks to Philipp Kewisch.
Many problems since last update yesterday to 128.5.1
Can only write to one of my calendars, can not close reminder, can not add new calendar...
Thunderbird version 128.8.1esr (64-Bit)

This review is for a previous version of the add-on (128.5.1).