program dead block, very strange!!!

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

Window {
    id: window
    visible: true
    width: 800
    height: 600

    ColumnLayout {
        width: parent.width
        Button {
            text: "Run"
            Component.onCompleted: {
                // I don't know, why here log a message will dead block to program...
                console.log("1122");
            }
        }
    }
}