Loading a save file on an older version of the game after it has been saved on a newer version can sometimes cause save corruption.
When discussing Nintendo Switch backups and homebrew, you will frequently see the term . Definition: NSP stands for Nintendo Submission Package. Mario Strikers Battle League -NSP--Update 1.3.2...
Following those major content drops, Nintendo shifted to maintenance patches to ensure the game runs smoothly. What is included in Update 1.3.2? Loading a save file on an older version