Reveal.js `. . .` fragments don't work with headers

Bug description

I can't use . . . with or near headers

---
title: "Untitled"
format: revealjs
editor: visual
---

## This doesn't work

. . .

### hello

. . .

### there


## This also doesn't work

### A bit of preamble

. . .

now something to reveal

. . . 

and a bit more

## I expect these to work the same as this slide

. . .

hello

. . . 

there

I expected the first two slides to behave like the third.

quarto check

[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.1: OK
      Dart Sass version 1.55.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.3.280
      Path: /Applications/quarto/bin

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

[✓] Checking Python 3 installation....OK
      Version: 3.10.9
      Path: /opt/homebrew/opt/python@3.10/bin/python3.10
      Jupyter: 5.2.0
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.2.2
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Users/malcolmbarrett/Library/R/arm64/4.2/library
        - /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library
      knitr: 1.42
      rmarkdown: 2.20

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

On MacOS Montery

Checklist

• Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
• Please format your issue so it is easier for us to read the bug report.
• Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
• Please document the operating system you're running. If on Linux, please provide the specific distribution.
• Please provide the output of quarto check so we know which version of quarto and its dependencies you're running.