dataLabels.softConnector changing style of the connector to not softened if set to false.
dataLabels.softConnector is not changing style of the connector.
Click on two examples included in the API under following link. Compare.
Changing Highcharts version to 4.2.2 in the example makes them working correctly, so the issue is likely to be since 5.0.
Looks this.options.softConnector returns undefined and defaults to true in seriesTypes.pie.prototype.connectorPath.
Fixed #5868, dataLabels.softConnector was always set to true.
@wojtekmaj - thank you for reporting!
No extra unit test, as we already have pie-datalabels-softconnector-false and pie-datalabels-softconnector-true tests.