Events disappearing in Calendar

Events disappearing in Calendar

To reproduce the bug:

1.- Add a new event in Calendar
2.- Type any name for the Event
3.- Click "Create"
4.- The event appears
5.- Click on the event to open it
6.- Optional: Edit the event
7.- Click OK
8.- After two seconds, the event disappears

Now, click on another day and then come back to the inserted event's day. The event appears.