Opening a notebook causes an unsaved state?

[JPvRiel]

It's driving me nuts that notebooks, even if just opened to read and refer to it, without re-running any cells or making any changes, it often seems to have unsaved changes.

I'm a bit confused as to why, whenever I seem to simply just open and read, but not change a Jupyter notebook, vscode shows it's in an unsaved state. It's a headache because then, when I save it, functionally, the notebook has not changed at all. E.g. the user made no changes.

However, if I save it regardless of making changes, and compare a previous file copy to the I notice that each cell seems to have added language metadata to every cell. E.g. left is new saved version, right old version opened for reading only.

Perhaps recent changes in vscode have caused this metadata stuff, so any older notebook is always going to show it has unsaved changes even when the user made no changes?