Steps to reproduce:
1. Create a new series with the organizer "Hello World"
2. Try to filter for series with the organizer "Hello World"
Step 2 cannot be done because the value "Hello World" is not (yet) available for the filter organizers.
The value should be available.
This also affects other filters like Event.presenter
Workaround (if any):
After a page reload, the filter values are available.