Piranha Plant was recently added as the newest playable character in Super Smash Bros. Ultimate. Several reports have been claiming that using this fighter in the All-Star Mode could corrupt your save file, but Nintendo of America is saying it is “unable to confirm” the issues:
“We are aware that some users are posting about possible issues with the latest Super Smash Bros. Ultimate update. After extensive testing, Nintendo has not been able to confirm that there is an issue, although we will continue to investigate and monitor the situation.”
Source: Newsweek.com
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