[Owncloud] Events appear twice in the Calendar cause of two groups

[Laubie]

Hi there,
we use Owncloud for our Schoolserver now, but like old teachers are,
it's not easy to make it right for them.

We created a Calendar for all the Exams to write in the Sek.1.
The Calendar belongs to "admin". Admin shares it with the group
"teacher" (only read-access) and with the group "school management"
(full access).
Now, when a member of both groups (Every member of the school management
is a teacher too ;)) looks into the calendar, he has every event twice.
They also have the Exam-calendar twice.

Is there a workaround for that? Is it a bug? Is it a feature?

Nice weekend,
Laubie
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