Section cross-references do not work in PDF when using number-sections: false

Bug description

Section cross-references do not work in PDF when using number-sections: false

_quarto.yml:

project:
  type: book

book:
  title: "Quarto_Example"
  author: "Norah Jones"
  date: "5.6.2024"
  chapters:
    - index.qmd
    - intro.qmd
    - summary.qmd
    - references.qmd

bibliography: references.bib

number-sections: false

format:
  html:
    theme: cosmo
  pdf:
    documentclass: scrreprt
    
editor: visual

intro.qmd:

Introduction {#sec-newer}

This is a book created from markdown and executable code.

See @knuth84 for additional discussion of literate programming.

{r}
1 + 1

And now have a look at the newer part @sec-newer.

This works in the .html file just fine. But in the PDF, I only see the prefix ("Chapter") without the name of the chapter to read / click on. Any idea why?

HTML:

PDF:

I have experienced this with different quarto versions. Interestingly, when not using number-sections: false, the cross-references work fine both in the PDF and html file.

Steps to reproduce

No response

Expected behavior

I expect the chapter name to appear both in the html file and the PDF.

Actual behavior

The chapter name only appears in the html file. It remains empty with only the prefix in the PDF.

Your environment

• Rstudio 2024.04.1 Build 748
• Windows 10
• Quarto 1.5.41 but also earlier versions

Quarto check output

$ quarto check
Quarto 1.5.41
[>] 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: 1.5.41
Path: C:\Users\user\AppData\Local\Programs\Quarto\bin
CodePage: 1252

[>] Checking tools....................OK
TinyTeX: v2024.05
Chromium: (not installed)

[>] Checking LaTeX....................OK
Using: TinyTex
Path: C:\Users\user\AppData\Roaming\TinyTeX\bin\windows
Version: 2024

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

[>] Checking Python 3 installation....OK
Version: 3.10.5
Path: C:/Program Files/Python310/python.exe
Jupyter: (None)

  Jupyter is not available in this Python installation.
  Install with py -m pip install jupyter

[>] Checking R installation...........OK
Version: 4.2.3
Path: C:/Users/user/AppData/Local/Programs/R/R-4.2.3
LibPaths:
- C:/Users/user/AppData/Local/Programs/R/R-4.2.3/library
knitr: 1.42
rmarkdown: 2.21

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