Empty balloon tips in via-link shared calendar

[matepate]

I have shared a calendar via link in which all events in the calendar are created with the "show as" option set to "show full event". If I open the sharing link, I can see all events but when I click on an entry to open the balloon tip, they stay empty.

To reproduce:

1. Create an event with visibility set to show full event
2. share the calendar via link
3. open link and click an the entry created previously

Thank you for your great work!

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