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The reason why the data on SD cards gets deleted is because the Switch has poor compatibility with exfat SD cards. This same bug happened with the Piranha Plant DLC and can easily be fixed.
And more importantly, THERE IS ZERO EVIDENCE SUPPORTING THE CLAIM THAT THIS BUG CAN ALTER THE SYSTEM NAND. ONLY ONE PERSON HAS "REPORTED" ON THIS THROUGH SPECULATION ALONE AND HAD NO PROOF. THIS. IS. FALSE. DO NOT SPREAD MISINFORMATION.
I want the game to flop as much as anybody, but if you want to be taken seriously, don't lie to people about the game's problems. You'll make fools out of the rest of us when no further evidence comes out.