Qtlocation run with linuxfb not draw MapPolyline

[poucz]

Hi,
I write simply code That draw line in map.
If I run the program in windows manager line is displayed corectly.
When I run the program without xserver ( with parametr -plugins linuxfb) map is displayed corectly, but no line is showen.

I need run program without xserver.
Can you help me?

Thank for help

import QtQuick 2.9
import QtQuick.Window 2.2
import QtLocation 5.6
import QtPositioning 5.6

Window {
    width: 640
    height: 480
    visible: true


    Plugin {
        id: mapPlugin
        name: "osm"
    }

    Map {
        anchors.fill: parent
        plugin: mapPlugin
        center: QtPositioning.coordinate(59.9, 10.75)
        zoomLevel: 14

        MapPolyline {
           path:[
            {latitude:59.85, longitude:10.70},
            {latitude:59.97, longitude:10.86}
           ]

           line.color: 'red'
           line.width: 5
        }

    }
}

[poucz]

Same behavior on Qt5.10 and Qt5.11 - maybe it's bug?