Can't collapse the first section

Steps to reproduce

## chapter1
## part1

## part2

## chapter2

Expected result

Can collapse all sections.

Actual result

No collapse icon for the first section
image

Environment

  • Operating system: Win 11 64bit Home
  • Debug info:
SYSTEM INFO:
	Obsidian version: v1.1.9
	Installer version: v0.15.8
	Operating system: Windows 10 Home China 10.0.22000
	Login status: not logged in
	Insider build toggle: off
	Live preview: on
	Legacy editor: off
	Base theme: dark
	Community theme: none
	Snippets enabled: 0
	Restricted mode: on

RECOMMENDATIONS:
	none

There’s nothing to collapse. Either (1) add a return after ## chapter 1

## chapter1

## part1

## part2

## chapter2

Or (2) change the heading level # chapter 1

# chapter1
## part1

## part2

## chapter2
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