Unable to pair to a py script in the same directory

I have this project.toml file and everything works just fine:

[tool.jupytext.formats]
"notebooks/" = "ipynb"
"src/" = "py"
"md/" = "md"

Now, I want to pair a notebook to a py script in the same directory as the notebook, so following the docs, I modified the toml file to:

[tool.jupytext.formats]
"notebooks/" = "ipynb,py"
"src/" = "py"
"md/" = "md"

and suddenly nothing works. I get the following error:

Unexpected error while saving file: notebooks/Untitled.ipynb 
Notebook base name 'src/Untitled' is not compatible with fmt=notebooks///ipynb. Make sure you use prefix roots in either none, or all of the paired formats

Although it does silently create Untitled.py and Untitled.md at respective directories after throwing this error, it does NOT create a py script in the notebooks directory.

So how can a sync a notebook to a py script in the same directory as the notebook without throwing errors?

[mwouts]

I see (that seems to be a reasonable limitation of the TOML format).

Could you try the compressed form, then?

[tool.jupytext]
formats = "notebooks///ipynb,notebooks///py:percent,src///py:percent,md///md"

[mwouts]

You’re welcome!