Extra dot in the number of the highest section heading in qmd docx

Bug description

When using number-sections: true, qmd docx produces an extra dot after the number of the Heading 1, which does not occur in Rmd word_document

Steps to reproduce

In qmd

---
title: "Untitled"
format: 
  docx:
    number-sections: true
---

# Heading 1

## Heading 2

### Heading 3

and in Rmd

---
title: "Untitled"
output: 
  word_document:
    number_sections: true

---


# Heading 1

## Heading 2

### Heading 3

Expected behavior

1 Heading 1
1.1 Heading 2
1.1.1 Heading 3

Actual behavior

1. Heading 1
   1.1 Heading 2
   1.1.1 Heading 3

Your environment

RStudio 2024.04.2
Windows 11

Quarto check output

Quarto 1.5.55
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.2.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.41.0: OK
      Typst version 0.11.0: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.5.55
      Path: C:\Program Files\Quarto\bin
      CodePage: 65001

[>] Checking tools....................OK
      TinyTeX: v2024.01
      Chromium: (not installed)

[>] Checking LaTeX....................OK
      Using: TinyTex
      Path: 
      Version: 2023

[>] Checking basic markdown render....OK

[>] Checking Python 3 installation....(None)

      Unable to locate an installed version of Python 3.
      Install Python 3 from https://www.python.org/downloads/

[>] Checking R installation...........OK
      Version: 4.3.3
      Path: C:/PROGRA~1/R/R-4.3.3
      LibPaths:
        - C:/win-library
        - C:/Program Files/R/R-4.3.3/library
      knitr: 1.48
      rmarkdown: 2.27

[>] Checking Knitr engine render......OK

Render the supplied qmd example with docx and number-sections enabled, then compare its Heading 1 numbering with the expected output and the Rmd word_document result. Trace the Quarto CLI/Pandoc docx heading-numbering path; done means the extra dot is removed while the 1.1 and 1.1.1 headings remain correct.