Multiple "when"-conditions for a State

[qwasder]

Hi all.
Say I have following states:

@
State
{
name: "red_state"
when: color === "red"
},
State
{
name: "blue_state"
when: color === "blue"
},
State
{
name: "circle_state"
when: shape === "circle"
},
State
{
name: "blue_circle_state"
when: color === "blue" && shape === "circle"
}
@

The "blue_circle_state" is never triggered, why is this? Is there a better way to have several conditions for a State?