I think the logic here is that if B interfered with the catcher's throw to 2B, but they got the out anyway at 2B, it is just as if B had not made the interference. The result of the play is the same as it would have been had there been no interference. There is no need for further penalty since the inteference was not enough to stop catcher from doing what he was trying to do - i.e. get the runner out at 2B.
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