I tried creating a new harness and sections and had a grid just with pyID and tried open work by handle. I am getting the preview option on hover but on click of that preview the whole case is opening instead of the right slider.
The difference I could see is in dashboard and My Work the harness are in Data-Portal where as my harness is in my Work class. I think the dashboard and MyWork is opening it in a new thread for the right slider (pycasepreview) where as in the harness I created it is continuing in same thread and opening the whole work item.
Kindly let me know if any other options can be tried out.