[Wix] Unable to open a project when are used wix.extensions property

If try to add to the Wix product the wix.extensions property, and try to open a project from QtCreator, then occurs an parsing error:

E:\git\ng\qbs\tests\manual\WiXInstallers\WiXInstallers.qbs:9: error: WixUIExtension,ReferenceError: Can't find variable: type

import qbs

Project {
    WindowsInstallerPackage {
        name: "QbsSetup"
        targetName: "qbs-" + qbs.architecture
        files: ["QbsSetup.wxs", "ExampleScript.bat"]
        wix.defines: ["scriptName=ExampleScript.bat"]

        wix.extensions: ["WixUIExtension"] // << try to add this string
    }
}

It is strange, because previous version of QtCreator (3.4.0) is works..

If try to modify the WiXModule.qbs from:

 property stringList extensions: type.contains("wixsetup") ? ["WixBalExtension"] : [] // default to WiX Standard Bootstrapper extension

to:

 property stringList extensions: product.type.contains("wixsetup") ? ["WixBalExtension"] : [] // default to WiX Standard Bootstrapper extension

then says that:

E:\git\ng\qbs\tests\manual\WiXInstallers\WiXInstallers.qbs:9: error: WixUIExtension,ReferenceError: Can't find variable: product

BUT!! If try to change stringList to string property, then all fine..

Seems, that this bug related to stringList property (or something similar).