I am working in a very old org where majority of the contacts do not have a recordtypeid, and contact visibility, page layout assignments revolve around this master no record type id contact record.
A process incorrectly created a series of contacts with a recordtypeid assigned and to align them with the rest of the org, we are attempting to remove the recordtypeid.
However we are unable to do this. Data loader and dev console although they take the update, the update does not reflect a removed recordtypeid, the populated record type id persists.
Is it not possible to set a recordtype id to null after one has been set?