When editing a command using ledger-report-edit-report, the user is presented with the ledger-report-format-specifiers already expanded. This means if they save the edit, the format specifier values will then be hard coded.
I intend to open a PR to store the un-expanded report command in ledger-report-cmd and wait until ledger-do-report to actual expand the command. I wanted to open this issue to document the problem.