Aaaaand Google is my friend. "Metasapients and shapeshifters who select Priority A, B, C, or D for Magic have their natural Magic of 1 replaced with their new Magic attribute."
Looks like the 1 is just there as a base that gets replaced if you take any magic level. I'm guessing it's there since metasapients have abilities keyed off magic, like the infected and having a 1 there allows you to add to it at character creation without having to be an awakened character.
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