qmllint crashes in a combination with ListModel

import QtQuick

ListModel {
    id: listModel

    property var test: UnknownType {
        property int test2: Unknown.value;
    }
}

$ qtbase/bin/qmllint qmllint-issue/test.qml
Warning: qmllint-issue/test.qml: UnknownType was not found. Did you add all import paths?
ASSERT: "!m_currentScope->baseType().isNull()" in file /home/noelma/work/qt-git/qtdeclarative/src/qmlcompiler/qqmljstypepropagator.cpp, line 276
Aborted (core dumped)

import QtQuick

Item {
    ListModel {
        id: listModel
    }

    property var test: UnknownType {
        property int test2: Unknown.value;
    }
}

$ qtbase/bin/qmllint qmllint-issue/test2.qml
Warning: qmllint-issue/test2.qml: UnknownType was not found. Did you add all import paths?
Warning: qmllint-issue/test2.qml:9:29: Unqualified access
        property int test2: Unknown.value;
                            ^^^^^^^

import QtQuick

Item {
    id: item

    property var test: UnknownType {
        property int test2: Unknown.value;
    }
}

$ qtbase/bin/qmllint qmllint-issue/test3.qml
Warning: qmllint-issue/test3.qml: UnknownType was not found. Did you add all import paths?
Warning: qmllint-issue/test3.qml:7:29: Unqualified access
        property int test2: Unknown.value;
                            ^^^^^^^