Single file with same name as folder is stripped from sidebar (Category index) - since 2.0.0-beta.19

[ambroiseRabier]

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

Since 2.0.0-beta.19, a folder docs/Same with a single file docs/Same/Same.md is not shown in sidebar. It work in 2.0.0-beta.18 as documented here.

Observe Same folder being absent from the sidebar:

Reproducible demo

https://stackblitz.com/edit/github-vnuu5v?file=docs/Same/Same.md

Steps to reproduce

1. Create a folder docs/Same.
2. Create a file docs/Same/Same.md
3. Observe the sidebar not displaying "Same" link item.

Expected behavior

With a folder docs/Same containing a single file docs/Same/Same.md, the expected output as per https://docusaurus.io/docs/sidebar/autogenerated#category-index-convention would be to have the Sidebar display docs/Same as a link, linking to docs/Same/Same.md.

Actual behavior

A folder docs/Same with a single file docs/Same/Same.md is not shown in sidebar.

Note that if you rename the file to docs/Same/Different.md, or if add another file to docs/Same folder, it work as expected.

Your environment

• Public source code: https://stackblitz.com/edit/github-vnuu5v?file=docs/Same/Same.md
• Public site URL: https://stackblitz.com/edit/github-vnuu5v?file=docs/Same/Same.md
• Docusaurus version used: 2.0.0-beta.19 and 2.0.0-beta.20
• Environment name and version (e.g. Chrome 89, Node.js 16.4): Chrome
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): Windows 10

Self-service

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

[Josh-Cena]

Duplicate of #7348

[Josh-Cena]

You can try using the canary version