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I really, really, really highly doubt that it is. There's no indication of races and/or classes affecting drops in anyway that has been seen in almost two years. So to be more direct;
No, I'm 99.99%...

This thread is really more for V.1 offline users. In V.1, Kubara Wood was about as rare as a rare spawn in AotI offline. You didn't find it unless you looked for it and even then, only very sparsely....

Actually, that's exactly the case. You can find it in "What's in the ruins?"
on Parum but it is indeed very rare.