Smallest test case possible!

import qbs

Product {
    Depends { name: "Qt.core" }
}

The product has no type set, and this results in an error:

ERROR: /share/qbs/modules/cpp/DarwinGCC.qbs:48:45 Unsupported product type . Must be in {applicationbundle, frameworkbundle, bundle}.

BundleTools.packageType is called by DarwinGCC.defaultInfoPlist, whose ONLY caller in all of QBS is the infoplist Rule. However, a print statement prior to that call does nothing, which leads me to believe the defaultInfoPlist property is being evaluated erroneously through some other means.