It is not possible to export from the Kanban backlog board

Description

It is not possible to export from the Kanban backlog board

Pre-conditions
Enable Kanban Backlog board

1. Go to Kanban Board and click on the "Board" button and choose "Configure"
2. Select Columns on left side
3. Drag and drop the status backlog, to the first column Kanban Backlog:
   
4. Go back and click on Backlog board

How to reproduce

1. Open the Backlog board and export from here.

Actual result/Attachments
It keeps spinning and nothing happens.

Expected result

The export should be done.