Fenced div problem: listing with `date-format: long` and `lang: de`

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• searched the issue tracker for similar issues
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• formatted my issue following the Bug Reports guide

Bug description

I recently upgraded to Quarto 1.7.32.
I have a quarto project with the language set to German in the _quarto.yml. When I use a listing with date-format: long, I get multiple warnings like this one:

[WARNING] Div at line 12 column 1 unclosed at line 128 column 1, closing implicitly.
WARNING
The following string was found in the document: :::
This usually indicates a problem with a fenced div in the document. Please check the document for errors.

The document ist rendered, but the page with the listing looks weird and has multiple ":::" displayed on the page.

Steps to reproduce

GitHub repository containing a reproducible example

Actual behavior

No response

Expected behavior

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Your environment

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Quarto check output

Quarto 1.7.32
[>] Checking environment information...
[>] Checking versions of quarto binary dependencies...
Pandoc version 3.6.3: OK
Dart Sass version 1.85.1: OK
Deno version 1.46.3: OK
Typst version 0.13.0: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
Version: 1.7.32
CodePage: 1252

[>] Checking tools....................OK
TinyTeX: v2025.08.02
Chromium: (not installed)

[>] Checking LaTeX....................OK
Using: TinyTex
Version: 2025

[>] Checking Chrome Headless....................OK
Using: Chrome found on system
Source: Windows Registry

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

[>] Checking Python 3 installation....OK
Version: 3.13.6
Jupyter: 5.9.1
Kernels: python3

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

[>] Checking R installation...........OK
Version: 4.5.1
knitr: 1.50
rmarkdown: 2.30

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