VSCode outline fails in Rmarkdown document if there is pseudo chunk text inside the chunks

[statnmap]

I know this is a specific case.
I am building functions inside a Rmarkdown document, which builds chunks.
I remarked that, as soon as there is 3 backticks in my code, the VSCode document outline is not displayed.

Here is a reprex.
With this code, there is no outline available in VSCode, near the Rmd name

---
title: "test vscode"
output: html_document
author: statnmap
---

```{r development, include=FALSE}
library(testthat)
```

# combine_tbl_to_file

```{r function}
#' Create R code chunk content
#' @return A character string of R code chunk content
#' @noRd
create_r_chunk <- function() {
  paste(
    "```{r}",
    "```",
    sep = "\n"
  )
}

cat(create_r_chunk())
```

As soon as I remove the paste with backticks, the outline is correct:

---
title: "test vscode"
output: html_document
author: statnmap
---

```{r development, include=FALSE}
library(testthat)
```

# combine_tbl_to_file

```{r function}
#' Create R code chunk content
#' @return A character string of R code chunk content
#' @noRd
create_r_chunk <- function() {
  paste(
    "",
    sep = "\n"
  )
}

cat(create_r_chunk())
```

Maybe the parsing you use to detect chunks can be a little more restrictive, and only considering chunks when there is nothing or spaces before the backticks ?

You could maybe use patterns used by {knitr}:

r$> knitr:::all_patterns$md
$chunk.begin
[1] "^[\t >]*```+\\s*\\{([a-zA-Z0-9_]+( *[ ,].*)?)\\}\\s*$"

$chunk.end
[1] "^[\t >]*```+\\s*$"

$ref.chunk
[1] "^\\s*<<(.+)>>\\s*$"

$inline.code
[1] "(?<!(^``))(?<!(\n``))`r[ #]([^`]+)\\s*`"