Minor issue, not a bug, so posting here instead of in the bug reporting thread.
The Master of Alteration promotion requires Master of Life and Nature, which requires Life 3 and Nature 3. But it's the Divination tech, not Alteration, that allows building a Life Mana node.
Similarly, Master of Divination requires Master of Creation, which requires Creation 3, but it's the Alteration tech, not Divination, that allows building a Creation node.
So to be consistent, I would suggest flipping this around in one of two ways:
1) Change Master of Life and Nature to Master of Creation and Nature, requiring Creation 3 and Nature 3, and change Master of Creation to Master of Life, requiring Life 3. To keep things simple, don't change the effects of the "Master" promotions in question.
2) Alternatively, switch Creation Mana to Divination and Life Mana to Alteration. Might be easier to program, which is why I suggest it, but I prefer my first proposed solution.