Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

I'm trying to diagnose a duplicated route warning, and I'm not sure what the problem is, I suspect it's a bug.

Reproducible demo

https://codesandbox.io/p/devbox/pensive-neumann-8hhhvs

Steps to reproduce

1. Create a file structure with similar file names, but in different folders. So different ids.

   

2. Add them in a TOC with the autogenerated instruction:

 {
      type: "category",
      label: "service",
      link: {
        id: "tools/cli/service",   // This is like the one below but that's a file.
        type: "doc",
      },
      items: [
        {
          type: "autogenerated",
          dirName: "tools/cli/service", // That's a directory, not a file.
        },
      ],
    },

3. Build and get a duplicated route warning:

[WARNING] Duplicate routes found!
- Attempting to create page at /docs/tools/cli/service, but a page already exists at this route.
This could lead to non-deterministic routing behavior.

In my case, there is only 1 file, or page, living there (see repro) but I do have a folder with the same path.

Expected behavior

I shouldn't see a warning, since there is no file path duplication. Only one page will be rendered at that location.

Actual behavior

I get a duplicated route warning.

Your environment

• Docusaurus version used: 3.1
• Environment name and version (e.g. Chrome 89, Node.js 16.4):
• Operating system and version (e.g. Ubuntu 20.04.2 LTS):

Self-service

• I'd be willing to fix this bug myself.