Callout following code block renders poorly in docx

Bug description

When a callout block is the element immediately following a code block, (e.g. a figure or gt table), in docx format the two items are rendered in one table on separate rows. The callout then gets a very narrow right margin and doesn't display correctly. The pattern can only be broken by inserting a plaintext element in between the code block and the callout div, like some text or a horizontal rule.

Steps to reproduce

---
title: "Reprex: docx callouts following code blocks"
format: docx
---

```{r}
#| label: fig-test
#| echo: false

image(volcano)

```

::: {#tip-simple .callout-tip collapse="true" appearance="minimal" title="Simple tip"}
Lorem ipsum
:::

------------------------------------------------------------------------

```{r}
#| label: fig-test2
#| echo: false

image(volcano)

```

spacing text

::: {#tip-simple2 .callout-tip collapse="true" appearance="minimal" title="Simple tip"}
Lorem ipsum
:::

Expected behavior

Code blocks and following callouts should be isolated elements in docx output

Actual behavior

Code blocks and following callouts are merged into a single table

Your environment

• IDE: Rstudio RStudio 2024.09.1+394
• R version 4.4.2
• OS: Windows 10
• Quarto: 1.6.39 (problem persists in 1.7.2)

Quarto check output

Quarto 1.6.39
[>] Checking environment information...
      Quarto cache location: C:\Users\OBrienL\AppData\Local\quarto
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.6.39
      Path: C:\Users\OBrienL\AppData\Local\Programs\Quarto\bin
      CodePage: 1252

[>] Checking tools....................OK
      TinyTeX: v2024.02
      Chromium: (not installed)

[>] Checking LaTeX....................OK
      Using: TinyTex
      Path: C:\Users\OBrienL\AppData\Roaming\TinyTeX\bin\windows\
      Version: 2023

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

[>] Checking Python 3 installation....OK
      Version: 3.11.4
      Path: C:/Python311/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:/R/R-4.4.2
      LibPaths:
        - C:/R/R-4.4.2/library
      knitr: 1.49
      rmarkdown: 2.29

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

Start by rendering the supplied Quarto .qmd reproducer to docx, comparing the callout immediately after the code block with the version separated by text or a horizontal rule. Trace the docx output path responsible for combining adjacent elements; done means code blocks and following callouts render as separate elements without a narrow callout margin.