### Bug description

I have been copying and running the same qmd file week in and week out.  This week when I ran it, it printed:

::: panel tabset


:::

Instead of creating tabs it worked only as headers, but when I threw in some dummy tabs elsewhere in the document, tabs were created, ie.

::: panel tabset

## does
this

## work
oh

## my
it did

:::

The website I have been populating is:

https://racing-focus.netlify.app/posts/hk_2023-02-01/standard.html

If you look at the posts, todays post I reverted to a table of contents style post with conventional headers.

I tried to drag and drop the qmd files, but that failed so I renamed them .txt.  The file I used today and the previous ones that worked. I am not a 'good' programmer and apologise for the code you will see.

The qmd file relies on a couple of csv files which I have added too.

I am using the following version of rstudio and I have been for a little while now.

RStudio 2022.07.2+576 "Spotted Wakerobin" Release (e7373ef832b49b2a9b88162cfe7eac5f22c40b34, 2022-09-06) for macOS
Mozilla/5.0 (Macintosh; Intel Mac OS X 11_5_2) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.12.10 Chrome/69.0.3497.128 Safari/537.36

I am using a Mac.  I don't have a bug report, because it works, it just prints ::: panel tabset.

I googled for an answer and couldn't find one or one on here.  Thanks and Sorry.

[standard_prev.txt](https://github.com/quarto-dev/quarto-cli/files/10610738/standard_prev.txt)
[standard_today
[hkedit.csv](https://github.com/quarto-dev/quarto-cli/files/10610744/hkedit.csv)

[red.csv](https://github.com/quarto-dev/quarto-cli/files/10610742/red.csv)
.txt](https://github.com/quarto-dev/quarto-cli/files/10610739/standard_today.txt)


### Checklist

- [X] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [X] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] Please document the operating system you're running. If on Linux, please provide the specific distribution.
2023-02-05T10:57:50Z
racing-focus
bug needs-repro
closed
Quarto - Panel Tabset
https://github.com/quarto-dev/quarto-cli/issues/4230