Sky color is wrong

[florentpeyrard]

For instance, with default preset, sky color looks grey, whereas in the demo it looks blue. Forcing skyColor with skyType gradient doesn't look as the expected color. Using entity's material flat shader has no effect, neither flatShading parameter. Only horizonColor (without skyColor) makes the sky color look as expected (not the horizon itself !).
Afrme 0.8.2, aframe-environment-component 1.1.0.