Not sure where to put this to get the most visibility: I just had a problem with speedbooster that blew my mind, for some reason it was taking about an extra half a screen to start up, I eventually solved it by turning my switch off and back on, this is mostly a warning to others and wondering if anyone else has run in to this problem.

I have not run into such a problem. I'm guessing no one else has reported such an issue yet? I wonder what causes it.

Updating here for visibility since this is now known: This is caused by a flag failing to be updated, specifically from the Experiment Z57 fight, it's meant to prevent you from getting a shinespark before he does his flappy bird attack. If you leave the fight before that by death or reload or quitting to menu, the flag will remain, and any further play will be affected until it is updated by finishing the fight or reset by resetting the game.

That's... quite the oversight, A, and B, wow, it's no wonder I couldn't shinespark before the Flappy Bird sequence.