[Solved]-Labels are not rendering for plotLines highcharts-Highcharts

This problem is a bug and it is reported here: https://github.com/highcharts/highcharts/issues/8477

To make it work in versions lower than 6.1.1 use this workaround:

Highcharts.wrap(Highcharts.Axis.prototype, 'getPlotLinePath', function(proceed) {
    var path = proceed.apply(this, Array.prototype.slice.call(arguments, 1));
    if (path) {
        path.flat = false;
    }
    return path;
});

Live demo: https://jsfiddle.net/BlackLabel/grpwztL3/