ii pykolab 0.8.14-0~kolab2 all Kolab Groupware daemon and utilities
Debian Stretch 9.11
it seems that iRony is sending/advertising full read/write access for shared readonly calendars falsely.
This problem is reproducible with Thunderbird + TbSync + DAV-4-TbSync.
Shared readonly addressbooks are not affected.
I have contacted the developer for TbSync + DAV-4-TbSync and send him a debug.log from TbSync Manager.
This report clearly shows that iRony is advertising full read/write access instead of readonly.
This bug leads to invitation problems I have already described here...