Neo4j knowledge graph returns no landmark nodes even after ETL successfully runs

After running an ETL pipeline that extracts a knowledge graph from Q&A content into Neo4j, graph_initialize returns an empty landmarks array even though nodes were created successfully. The graph has Problem, Solution, and RootCause nodes, but no Pattern nodes, and isLandmark is false on everything.

Setup:

• Neo4j AuraDB with GDS plugin
• Nightly pipeline: ETL extraction → pageRank scoring → isLandmark promotion
• pageRank scores all returned 0.0 despite nodes existing

The GDS pipeline ran without errors. What causes this?