Second QtQuickView doesn't work

When my layout have two separate QtQuickView objects then QtQuickView doesn't work. 

loadComponent() doesn't work because onStatusChanged() event doesn't come and qml component is not on screen. In my example (attachment) occasionally (1/10) main qml component is loaded succesfully. When main qml is loaded successfully and I press load cube button nothing does happend.

It is enought when this line is added

m_qtQuickViewCube = new QtQuickView(this);

after that QtQuickView is not working properly.