Left is the first time playing through the stage. Right is continuing from the mid-point. This is the first stage of world six in the Japanese version. I have no idea if this happens in the NA version, which I have played much more, but I have an inkling it might not. The Japanese versions of older games did often serve as a bit of a beta test in the modern sense of the phrase. The game as a whole feels a bit slipperier than I remember. Could be coming to this after playing Super Mario 3D World, I will grant that. Although I am sending Mario to many more deaths than I ever did as a child.
It is either the game’s fault or mine. And goodness, with my age increasing as it is I would much rather blame the game.