Being very brief on this one, as it’s probably just a code doesn’t match the graphics problem. Accidently clicked Singular Strike with only 3 in Woe, but it learned it. Afterwards I respec’d fully out of Woe, and could keep Singular Purpose. Played around a bit more with the tree and Void Aegis seems to have the same problem, not requiring Future Mind.
(screenshot from initial point in Singular Purpose)