Bug Report

Steps to reproduce

1. Use this configuration:

      window.$docsify = {
        subMaxLevel: 2,
        loadSidebar: true
      };

2. Use a _sidebar.md, it could be as simple as:

- [Home](/)

2. add a file with 2 embedded files, such as:

# Hello

Hello world

## Title 1

Lorem ipsum

[insert something](file.mp4 ":include")

[insert something else](file.mp4 ":include")

You can also see it live in https://codesandbox.io/s/problem-with-docsify-4cyldv

What is current behaviour

The Toc is generated twice, but in a nested way. In the above example, this looks like it:

• Home
  • Title 1
  • Hello
    • Title 1

See also this screenshot:

What is the expected behaviour

We have the TOC only once, this should look like this in this case:

• Home
  • Title 1

This happens when there's only one embedded asset.

Other relevant information

• Bug does still occur when all/other plugins are disabled?

• Your OS: not relevant

• Node.js version: not relevant

• npm/yarn version: not relevant

• Browser version: Firefox 103, but I also tried in Chrome stable, so I believei t's not relevant

• Docsify version: 4.12.2

• Docsify plugins: none

Please create a reproducible sandbox

https://codesandbox.io/s/problem-with-docsify-zl23lm

Mention the docsify version in which this bug was not present (if any)

I haven't tried earlier versions, it's the first time I try this.