Ok. I see what you said is logically correct but lemme ask if you tried assembling the solution as a copy and see with which Customer ID it is being imported..? Coz you have a strong reason from your side that solution shouldn't have different Customer ID as the import was successful with which you can contact SAP even later.
fyi, CustomerID will be stored as a tag in the file sdi.sdimfst inside the solution zip.
