HI I was playing this and found a pretty useless clip but this is the most active community so thought I would put it here.

In shifting sand lands select luigi and star 2. head straight and to the right and run triple jump and dive towards the top of the pillar. if done right the screen will alternate between luigi infinitely falling and a bright blue top screen.

Just let me know if you could reproduce this glitch or if it's a crazy one time thing

Is this the glitch you're referring to?

that is exactly what happened. do you know how it works?