Rotating parent does not rotate child collider correctly

Hello there, so I have parent gameObject with a box collider, and a child gameObject with a box collider. When I set the eulerAngles of parent in script, the childs collider does not follow, but in scene it shows to do so. The parent and child gameObjects are both rotating, but the childs collider is not. If I turn child collider on and off in inspector with mouse then the collider sets to right position.

Any idea why? Thanks.

 

the child's rotation in the inspector is it's rotation relative to the parent (i.e. "localRotation", not "rotation"). So rotating the parent will do nothing to the child's rotation in the inspector.