Highcharts Network Graph link labels not shown consistently - javascript

I've been struggling for the past few days with Highcharts Network Graph Link Labels:
network graph with link label
As shown in the screenshot, all labels are not displayed. We should see also 'test 2' between point C and point A.
The issue comes from the javascript arrow function. Whenever I remove it all labels are ok.
Currently, when the graph initializes all labels are here but fade away once it's done.
all details are in JSFiddle here
`Highcharts.chart('container', {
chart: {
type: 'networkgraph',
marginTop: 80,
backgroundColor: '#343a40' //couleur de fonds
},
title: {
text: 'Network graph',
style: {
color: 'white',
}
},
subtitle: {
text: 'A Force-Directed Network Graph',
style: {
color: 'white',
}
},
plotOptions: {
networkgraph: {
keys: ['from', 'to', 'clabel'],
layoutAlgorithm: {
enableSimulation: true,
integration: 'verlet', //euler or verlet euler takes into account velocity
maxIterations:250,
linkLength: 250
},
point: {
events: { }
},
colors: [],
},
},
series: [{
id: 'language-tree',
dataLabels: {
enabled: true,
shadow: false,
bold: false,
color: 'white',
style: {textOutline: 'none'},
allowedOverlap: false, style: {textOutline: false},
linkFormat:'{point.clabel}', // \u2192 {point.toNode.name}
y: -16
},
// Options for the links
link: {
color: 'white', // #9cd4d4 couleur des fleches 89CFF1
width: 1,
},
marker: {
enabled: true,
radius: 12
},
nodes: [
{'id': 'A'},
{'id': 'B'},
{'id': 'C'},
],
data: [
['A', 'B', 'test 1'],
['A', 'C', 'test 2'],
],
}]
});
`
Any help would be highly appreciated!
Thanks
I've tried to modify the highcharts main script before realizing issue was from the arrow function which I don't know how to enhance it.
I'd like to get all the labels shown in the middle of the each link

Quick and dirty solution:
.highcharts-label.highcharts-data-label {
opacity: 1 !important;
}

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