Marc Lelijveld provides a public service announcement:
When working with Notebooks in Microsoft Fabric, exporting and reusing them across environments or tenants might seem like a harmless, even convenient, task. Whether you’re sharing a template with a colleague, moving assets between workspaces, or contributing to the community — the last thing you’d expect is to accidentally include data along with your code.
But that’s exactly what can happen.
For people who have worked with Jupyter notebooks in the past, this is a fairly obvious result. But if you aren’t familiar with the platform, that idea may seem weird. Marc does provide some options for exporting notebook contents, and you can also clear the cell contents before exporting.