In the Chatflow knowledge retrieval step, no results can be retrieved.

[luboyan6]

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For the same input query and knowledge base configuration, results can be retrieved in Dify's knowledge base, but no results are returned during the knowledge retrieval step in Chatflow. How should I analyze and troubleshoot this issue?

[dosubot[bot]]

The most common reason for knowledge retrieval working in the knowledge base but failing in Chatflow is a mismatch in configuration or variable mapping between the two paths. In Chatflow, make sure the knowledge retrieval node is explicitly linked to the correct dataset(s), and that its retrieval parameters (search mode, rerank model, top_k, score threshold) match those used in your successful knowledge base test. Also, check that the query variable selector is set to pass the user's query (like sys.query) into the retrieval node—if this is misconfigured, retrieval will silently return empty results. Metadata filtering (disabled, automatic, manual) can also restrict results; try disabling filters to rule this out. If everything looks correct, create a minimal workflow with explicit dataset linkage and query variable mapping to isolate the issue, and inspect backend logs for errors or warnings during workflow execution. Differences in configuration, dataset linking, query variable selection, or metadata filtering between the test interface and workflow node are the most common causes for recall to succeed in one and fail in the other.
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