Custom Completed State Category - Fails during migration/import

We have created a custom value for the 'Completed' State Category. This fails with the following error message when running the process-migrator:

[VERBOSE] [2023-07-14T07:58:42.397Z] Exception message:VS403093: Team Services currently does not support changes to 'Completed' category. Choose a different category.
Call stack:Error: VS403093: Team Services currently does not support changes to 'Completed' category. Choose a different category.
    at RestClient.<anonymous> (C:\Users\Test\AppData\Roaming\npm\node_modules\process-migrator\node_modules\typed-rest-client\RestClient.js:173:31)
    at Generator.next (<anonymous>)
    at fulfilled (C:\Users\Test\AppData\Roaming\npm\node_modules\process-migrator\node_modules\typed-rest-client\RestClient.js:6:58)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
[ERROR] [2023-07-14T07:58:42.398Z] Import failed, see log file for details. Unable to create/hide/update state 'Approved' in 'business_layer.Milestone' work item type, see logs for details

The report identifies process-migrator's migration/import path and shows the failure through typed-rest-client while creating or updating the 'Approved' state in business_layer.Milestone. Start by locating the state-category handling and reproducing the import with a custom 'Completed' category; done means the import completes without VS403093 and preserves the intended state configuration.