`endfloat` package is not supported for quarto tables

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

See MWE below:

---
title: "Minimal Working Example for endfloat Package"
format:
  pdf:
    include-in-header:
      text: |
        \usepackage{endfloat}
    keep-tex: true
---

## Introduction

This document tests the LaTeX `endfloat` package in a Quarto PDF output. The `endfloat` package is configured to move figures to the end of the document while keeping tables in their original positions.

## Figure Example

Below is a figure that should appear at the end of the document due to the `endfloat` package.

```{r}
#| label: fig-sample
#| fig-cap: "This is a figure"
plot(1)
```

See @fig-sample for the figure reference.

## Table Example

Below is a table that should remain in its original position, as `endfloat` is configured to ignore tables.

```{r}
#| label: tbl-sample
#| tbl-cap: "A sample table"
#| echo: false
library(knitr)
data <- data.frame(
  A = c(1, 2, 3),
  B = c("X", "Y", "Z")
)
kable(data)
```

See @tbl-sample for the table reference.

## Conclusion

The figure (@fig-sample) should be placed at the end of the document, while the table (@tbl-sample) remains here in the main text.

My guess

I found the quarto tables uses longtable environment rather than table environment, this probably the root of problem.

Here is the output:

endfloat-example.pdf

Steps to reproduce

No response

Actual behavior

No response

Expected behavior

No response

Your environment

No response

Quarto check output

 > quarto check
Quarto 1.7.29
[✓] Checking environment information...
      Quarto cache location: /Users/ming/Library/Caches/quarto
[✓] 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: 1.7.29
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2025.06
      Chromium: 869685

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/ming/Library/TinyTeX/bin/universal-darwin
      Version: 2025

[✓] 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 Python 3 installation....OK
      Version: 3.12.4 (Conda)
      Path: /Users/ming/.config/miniconda3/bin/python
      Jupyter: 5.7.2
      Kernels: python3

(|) Checking Jupyter engine render....2025-08-06 11:30:53,015 - traitlets - WARNING - Kernelspec name python3 cannot be found!
2025-08-06 11:30:53,015 - traitlets - ERROR - No such kernel named python3
Traceback (most recent call last):
  File "/Users/ming/.config/miniconda3/lib/python3.12/site-packages/jupyter_client/manager.py", line 87, in wrapper
    out = await method(self, *args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ming/.config/miniconda3/lib/python3.12/site-packages/jupyter_client/manager.py", line 435, in _async_start_kernel
    kernel_cmd, kw = await self._async_pre_start_kernel(**kw)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ming/.config/miniconda3/lib/python3.12/site-packages/jupyter_client/manager.py", line 397, in _async_pre_start_kernel
    self.kernel_spec,
    ^^^^^^^^^^^^^^^^
  File "/Users/ming/.config/miniconda3/lib/python3.12/site-packages/jupyter_client/manager.py", line 195, in kernel_spec
    self._kernel_spec = self.kernel_spec_manager.get_kernel_spec(self.kernel_name)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ming/.config/miniconda3/lib/python3.12/site-packages/jupyter_client/kernelspec.py", line 285, in get_kernel_spec
    raise NoSuchKernel(kernel_name)
jupyter_client.kernelspec.NoSuchKernel: No such kernel named python3


No such kernel named python3
[✓] Checking Jupyter engine render....OK

Start by rendering the provided MWE with Quarto PDF output and inspect the generated .tex file enabled by keep-tex, focusing on the longtable output and the endfloat configuration. Compare the generated document with the expected figure-at-end and table-in-place behavior, then use the smallest reproducible case to verify the corrected rendering.