Cannot create listing from sibling directory

I have:

• searched the issue tracker for similar issues
• installed the latest version of Quarto CLI
• formatted my issue following the Bug Reports guide

Bug description

When creating a listing in a subdirectory, standard notation for including a sibling directory does not appear to work.

Steps to reproduce

Minimal example in this repository.

/faculty/landing.qmd is supposed to include a listing of files in both /faculty and /shared directories

Actual behavior

Only the files in /faculty are shown in the rendered listing; despite several attempts to indicate the /shared directory as another source of files, system

Expected behavior

Files in /shared should also be included in the listing in /faculty/landing.qmd, e.g. by including

listing: 
    contents: 
        - .
        - ../shared

in the landing page's metadata.

Your environment

• IDE: VSCode 1.122.1
• OS: MacOS 26.5.1

Quarto check output

Quarto 1.9.38
[✓] Checking environment information...
      Quarto cache location: /Users/cgirard/Library/Caches/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.8.3: OK
      Dart Sass version 1.87.0: OK
      Deno version 2.4.5: OK
      Typst version 0.14.2: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.9.38
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: (not installed)
      Chromium: (not installed)
      Chrome Headless Shell: (not installed)
      VeraPDF: (not installed)

[✓] Checking LaTeX....................OK
      Using: Installation From Path
      Path: /Library/TeX/texbin
      Version: 2023

[✓] Checking Chrome Headless....................OK
      Using: Chrome found on system
      Path: /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
      Source: MacOS known location

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

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/

[✓] Checking Python 3 installation....OK
      Version: 3.12.3 (Conda)
      Path: /Users/cgirard/mambaforge/bin/python
      Jupyter: 5.7.2
      Kernels: python3

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

[✓] Checking Julia installation...

Start with the minimal sibling example repository and inspect /faculty/landing.qmd, especially its listing metadata. Render the document with Quarto and trace how the contents entries . and ../shared are resolved; the issue is done when the rendered listing includes files from both /faculty and /shared.