Issue with landscape mode to PDF adding `:::` around code block

[kyleGrealis]

I would like to have one page of a multi-page PDF in landscape mode. It is rendering:

::: .cell
“‘.r .cell-code 1 + 1 “‘
::: .cell-output .cell-output-stdout
“‘ [1] 2 “‘
::: :::

I'm a LaTeX novice. If another LaTeX solution is better please tell me. My code is below.

---
title: "Houston, we have a problem"
format:
  elsevier-pdf:
    include-in-header: 
      text: |
        \usepackage{lscape}
        \usepackage{pdflscape}
        \usepackage{rotating}
---

```{r}
1 + 1
```

\begin{landscape}

```{r}
1 + 1
```

\end{landscape}

```{r}
1 + 1
```

The results look like this:

I would be grateful for any help you can provide.

@kyleGrealis
@RaymondBalise

[raffaem]

The standard way to do this in modern Quarto is with the landscape codeblock

See https://stackoverflow.com/a/79319228/1719931