crossref values are displayed in html but not in pdf

Bug description

crossref attributes appendix-title and appendix-delim are not implemented in pdf.

Steps to reproduce

• Create a new quarto project in RStudio by invoking the default template as project "example".
• Add details.qmd in project directory with content "# Details".
• Tweak _quarto.yml as below.
• Run quarto render from terminal in project directory.

project:
  type: book

book:
  title: "example"
  author: "Norah Jones"
  date: "1/2/2025"
  chapters:
    - index.qmd
    - intro.qmd
    - summary.qmd
    - references.qmd
  appendices: 
    - details.qmd

crossref:
  appendix-title: "Attachment"
  appendix-delim: ":"

bibliography: references.bib

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

editor: visual

Expected behavior

I expect to see "Attachment A: Details" in example/_book/details.html and in example.pdf.

Actual behavior

I see "Attachment A: Details" in example/_book/details.html but in example.pdf I just see "A Details".

Your environment

• IDE: RStudio 2023.06.2 Build 561
• OS: Windows Version 10.0.19045 Build 19045

Quarto check output

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: 1.3.353
      Path: C:\Program Files\RStudio\resources\app\bin\quarto\bin
      CodePage: 1252

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

[>] Checking Python 3 installation....OK
      Version: 3.10.3
      Path: C:/Users/tim.bergsma/AppData/Local/Programs/Python/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: 4.4.2
      Path: C:/PROGRA~1/R/R-44~1.2
      LibPaths:
        - C:/Users/tim.bergsma/AppData/Local/R/win-library/4.4
        - C:/Program Files/R/R-4.4.2/library
      knitr: 1.42
      rmarkdown: 2.21

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