It is because of using temp view. To debug further you would need to write all the source tables, transformations, target tables, actual lineage and expected lineage, but as a rule of thumb if the lineage is lost when using temp view.

Lineage is captured at the table level, and it's most reliably tracked when both the source and target are referenced by table names. If you're creating a temporary view and then using that view to create a source_df which is then merged into a silver table, it's possible that the lineage tracking system is unable to capture this lineage due to the use of temporary view.