[REG 5.x -> 5.12] Javascript function calls not using local scope

import QtQuick 2.5

Item {
    property bool testFunc

    Item {
        function testFunc2() {
            console.log("testFunc2 called")
        }

        function testFunc() {
            console.log("testFunc called")
        }

        Component.onCompleted: {
            testFunc2()
            testFunc()   //  works fine before Qt 5.12
        }
    }

}

// Qt 5.11.2 output:
testFunc2 called
testFunc called

// Qt 5.12 output
testFunc2 called 
Test.qml:17: TypeError: Property '42' of context object is not a function