No, it's not the first time I saw extra roll and it wasn't a tutorial. It was discovery of the bog, I'm guessing you are yet to discover it.
Was this your first time you saw the extra roll function?
I'm pretty sure the game is set up in such a way that the first tutorial roll is designed to fail and the re-roll automatically succeeds just for tutorial purposes.
On my current playthrough I haven't been there yet, so I can quite easily check it.