firecrawl_research_search_papers returns 404 when using self-hosted Firecrawl

I'm using a self-hosted Firecrawl service, and most MCP search tools are working as expected. However, the firecrawl_research_search_papers tool consistently fails.

The error I receive is:

Tool 'firecrawl_research_search_papers' execution failed:

Request failed with status code 404

Environment

Firecrawl: Self-hosted MCP Server :

command: "npx"
    args:
      - "-y"
      - "firecrawl-mcp"

Expected Behavior

The firecrawl_research_search_papers tool should execute successfully and return research paper search results.

using a