I have a problem when using recurrent tasks with sogo, and I feel it can be a bug.

After I create the recurrent task (with ending date), I only see one instance of task and I cannot modify the single occurence of a specific date. Or I complete the whole task, or none, while I need to set as completed only some selected dates.

On thunderbird, a recurrent task is visualized both as task and as event, with each derived date being an event, so I can modify all the occurences, or just the single element.

Actually, this problem forces me to create recurrent events instead of recurrent tasks, but in this way I'm missing various task features which are important (state, % of work, completion).