Bad highlighting of nested code chunks in R Markdown documents

vscode-R incorrectly highlights nested code chunks in R Markdown documents, stopping after the first closing chunk. E.g.:

````{verbatim}

```{r}
foo <- 1
```

````

produces:

I'd expect to have the outermost chunk (verbatim here) fully highlighted. Note that the quarto extension highlights nested code chunks properly. That would be great to get this work for .Rmd files too though.

My system:

• OS: macOS 12.3.1
• VSCode Version: 1.87.1
• R version: 4.3.2
• vscode-R version: 2.8.2

Reproduce the nested verbatim and r example in an .Rmd file with the vscode-R extension, then compare its highlighting with the Quarto extension. Trace the extension's R Markdown highlighting entry point; done means the outer verbatim chunk remains highlighted through its closing fence without changing ordinary chunks.