Why would they just decide to have either permanent or nonexistent magnetism? I can't find the logic in it.
Remember in CS1? There was a challenge where the opponent had to be magnetised so you could do the basic collider>collider whiff>2b>2c>collider etc. combo, and it only works on magnetised opponents. Hence why you had to hit them with a drive move before the actual challenge to gain magnetism properties.
I guess they added, "Infinite Magnetism" on those challenges, so players wouldn't have to hit the opponent with a drive move before hand before doing the actual challenge. (I don't know which challenge but in one of Tager's CS2 challenges you can see it that the opponent is magnetised from the start till FOREVER) They probably forgot to add that "Infinite Magnetism" thing to challenge 9. So it's either "Infinite Magnetism" or "Non Magnetism at all".