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What happened to AQ crystals?

Can someone explain wtf happened to the carb and stony cores in aq crystals, yes I know it's been this way for a looong time now, but I'm trying to figure out when it happened. Also, why don't map 5 crystals give tier 1 alphas and fragments? It should be a full alpha actually since it's the hardest map besides map 6(which gives t2a fragments). There's us top players who rank 5* champs and have to worry about not having teir 1 alphas to rank because it takes like 5 teir 1 alphas for a rank 2 5* and so on(like wtf man?).
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(Also, sorry for the tier misspelling lol).