For any list-based setting (not sure what the Ember terminology is), there is a bug where clicking the input box and then clicking out of it will replace the contents with “[object FocusEvent]”. This occurs in Safari and Chrome (running on macOS) on a clean install of 2.9.0.beta6 with no plugins. No errors are reported in the logs or any messages in the browser console.
Steps to reproduce (this can be reproduced anywhere using a similar list setting component)