In the form for creating or editing an event, the year display is broken: Instead of the year, the string 'YYYY' is displayed.
Creating the event with the year set to this causes events to be created in the current year.
Additionally, the year displayed when opening an event by clicking on it is also set to 'YYYY'
The roundcube version is 1.2.0, calender version 3.2.9, libcalendaring version 3.2.9.
I am running this setup without kolab.