It has to do with a rather new concept known as "Modifiability". Usually (by default), test systems are the only ones where migration projects can be created/edited. In quality and production systems, transported projects can only be executed.
Should a change be required, it has to be done in modifiable systems and then, once again, transported.
All the necessary information can be found in the following documents:
3104790 - Modifiable Systems and Transport Concept, SAP S/4HANA Migration Cockpit - Migrate Data Using Staging Tables
3043614 - Modifiable Systems and Transport Concept, SAP S/4HANA Migration Cockpit - Migrate Data Directly From SAP
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