Hello Juan. Thanks for your comment. Indeed this is not the expected behavior. With the default_jupytext_formats="ipynb,py" option, the two files should be updated when you either save or copy the notebook.

Could you please double check, and then open an issue on our GitHub project ? Useful inputs will be

• the entire jupyter configuration (which, hopefully, is only two lines long)
• the console outputs, especially patterns like ‘Saving notebook.py’. I guess you don’t see ‘Saving notebook.ipynb’ there?