When the Cleanup option for eTransmit is set to "Include all sheets and" "Only include views on sheets", all of the electrical panel schedules are deleted in the transmittal model, even those included on sheets.

See also:
https://forums.autodesk.com/t5/revit-mep-forum/etransmit-delete-all-the-panel-schedules-from-the-mod...
My idea is: Don't delete electrical panel schedules on sheets when the option is set to include view on sheets.
I am not sure how Revit classifies things, but all other schedules work as expected, i.e., they are not deleted.