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

Combining routeBasePath: '/', with having each version at a specific path (the version itself) results in unknown pages rendering "blank" content (instead of the "Page not found" content).

Reproducible demo

https://stackblitz.com/edit/github-py3g6d?file=docusaurus.config.js

Steps to reproduce

From a fresh project:

$ npm run docusaurus docs:version 1.1.0

And add the following to the docs config:

          routeBasePath: '/',
          versions: {
            current: { path: '/current' },
            '1.1.0': { path: '/1.1.0' },
          },

then visit /foo route. No "Page Not Found" content 😢

Expected behavior

Render the "Page not found" content

Actual behavior

Empty page

Your environment

No response

Self-service

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