Code cells missing when used in tab-groups

[VeckoTheGecko]

Describe the bug

context

Code cells in tab groups are not rendered when using the myst_nb extension for Sphinx.

expectation

The code cells to appear

bug

Source

---
jupytext:
  text_representation:
    extension: .md
    format_name: myst
kernelspec:
  display_name: Python 3
  language: python
  name: python3
---

# Code cells in tab groups

## Control: standalone code cell (should render)

```{code-cell} python
print("hello from standalone cell")
```

## Reproducer: code cells inside tab-set (cells absent in output)

`````{tab-set}

````{tab-item} Tab 1
```{code-cell} python
print("hello from tab 1")
```
````

````{tab-item} Tab 2
```{code-cell} python
print("hello from tab 2")
```
````

`````

Picture

$ jupyter-book build mybook
ERROR ...

A minimal reproducer is available here https://github.com/VeckoTheGecko/repro-missing-code-cells-myst_nb using Pixi.

Simply clone the repo and run pixi run build, then open doc/_build/html to see the built files.

Reproduce the bug

See above

List your environment

No response

[VeckoTheGecko]

Hmmm, I'm not really sure if this is in-scope. I think its an interaction between sphinx-design and myst_nb that I'm not sure is possible to work around