Sales area custom panel

Is there an issue with adding a custom panel to the sales area?
When adding a panel, the title “Panels” is visible but the panel doesn’t show.
Adding the exact same panel to other areas (e.g. the products area) works as expected, so I do not believe the issue is with the panel (it is a simple .ascx with a single test div and no logic in the code behind).

Litium version: 6.2.0

There is a bug reported on this that is still not resolved:
Panels not visible in sales area