I don’t think it has an effect on that at all! LaLa is a master at what she does and if she would have thought for a second that those magnets would have an effect on her alchemy she would not have utilized them. I also dreamt about it happening before it happened and in my dream, it showed me not to worry because no matter what nothing can affect the alchemy, she puts into those bracelets.
Niceeeee... question though. What happens of the magnets fall out??