Home page renders twice, one below the other.

### Have you read the Contributing Guidelines on issues?

- [X] I have read the [Contributing Guidelines on issues](https://github.com/facebook/docusaurus/blob/main/CONTRIBUTING.md#issues).

### Prerequisites

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

### Description

The home page renders twice, one below the other. This happens only when I use the absolute path for example - https://docusaurus.io/index.html. The search and theme change button becomes unresponsive for the page rendered on top. This happens on the initial load only.

### Reproducible demo

_No response_

### Steps to reproduce

Check this URL - https://docusaurus.io/index.html

### Expected behavior

The home page should render the content once.

### Actual behavior

The home page renders content twice.


### Your environment

- Public source code:
- Public site URL:
- Docusaurus version used: **3.2.1**
- Environment name and version (e.g. Chrome 89, Node.js 16.4): **18.13.0**
- Operating system and version (e.g. Ubuntu 20.04.2 LTS): **Windows 10**

### Self-service

- [ ] I'd be willing to fix this bug myself.