Pokémon TCG: Sword and Shield—Brilliant Stars

Ruling?

If player A accidentally uses Claydols Cosmic Power after player B used (LA) Mespirits poke-power in the last turn, then what would happen?

ex: player A uses Cosmic Power, puts one card on the bottom of the deck then starts to draw. After player A draws the first card both the judge and player B catch the mistake, however player A has seen their top card. The ruling at our event was that player A would shuffle his/her deck but I was a bit uncertain of this ruling, was it correct?
 
Judges are allowed certain leeway in deciding how to handle these things.
If it is rewindable and the card can be determined and put back, many judges merely reveal that card to the opponent and leave it on top.

There are some judges that shuffle.
 
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