MCR-3771 set internal sourcepath of derivate to NULL on create

[rsteph-de]

Link to jira.

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[rsteph-de]

This is a suggestion that works for me in 2026.06 LTS - but
someone with more experience regarding the MCRMetadataManager should have a closer look!!!
starting with 2024.06 the related code parts are nearly unchanged till main (easy merge)
If this should be fixed in 2023.06 as well - more work is needed.