Incorrect heading level indentation

[kands-code]

Problem

As shown in the figure, subsec 1.2 should be at the same level as subsec 1.1, but in reality, subsec 1.2 is at the same level as sec 1 and sec 2, which is incorrect.

Steps

1. Create a brand new project: mkdir test && cd test && mdbook init --force
2. Modify the contents of the chapter_1.md file
3. Start preview: mdbook serve

File content as follows:

# Chapter 1

## sec 1

### subsec 1.1

#### subsubsec 1.1.1

### subsec 1.2

## sec 2

### subsec 2.1

Possible Solution(s)

No response

Notes

No response

Version

mdbook v0.5.0