Some techtree prerequisites don't work

[thyriel]

KSP Version: 0.25.0.642 (x64)

Some nodes in the techtree don't seem to work proper on their requirements. (Career mode)

For example "Supersonic Flight" says it needs Advanc. Construction and Aerodynamics, but it can be unlocked without aerodynamics. "High Altitude Flight" is the same. I could now unlock that without ever purchasing Aerodynamics or Supersonic Flight. (which makes no sense that i can invent a turbojet engine but don't even have a basic jet engine)

Looks like this applys to some other nodes too, but can't remember them all exactly. At least the node giving the atomic rocket is the first "grey" button i see in there.

[vexx32]

From what I recall, some tech tree nodes require one thing OR another, whereas others require BOTH prerequisites. It's not really clearly marked which is which, though...