Quarto to docx export

[JF12345]

I'm trying to export a simple docx file from Quarto. The export works as expected, but I see some extra square brackets around each section as seen in the attached figure. The qmd file is below as well. Any ideas on how I can resolve this?

---
title: "My Document"
format:
  docx:
    toc: true
    number-sections: true
    highlight-style: github
---

# Section 1

## Section 1.1 

# Section 2

[JF12345]

These brackets are a Word feature, and won't be printed. To disable them, the "bookmarks" checkbox has to be unchecked in "View" preferences. See screenshot below.Quarto to docx export