Label positioning on link between 2 ports (nodes) not working

[BuzzyLizzy]

Followed the basic demo example, the label does not work it is not on the line of the link between the 2 nodes, but in the top left corner of the canvas, here is my code, exactly that of the demo:

import createEngine, { DiagramModel, DefaultNodeModel, DefaultLinkModel } from '@projectstorm/react-diagrams';
import * as React from 'react';
import { CanvasWidget } from '@projectstorm/react-canvas-core';
import { DemoCanvasWidget } from '../helpers/DemoCanvasWidget';

export default () => {
	//1) setup the diagram engine
	var engine = createEngine();

	//2) setup the diagram model
	var model = new DiagramModel();

	//3-A) create a default node
	var node1 = new DefaultNodeModel({
		name: 'Node 1',
		color: 'rgb(0,192,255)'
	});
	node1.setPosition(100, 100);
	let port1 = node1.addOutPort('Out');

	//3-B) create another default node
	var node2 = new DefaultNodeModel('Node 2', 'rgb(192,255,0)');
	let port2 = node2.addInPort('In');
	node2.setPosition(400, 100);

	// link the ports
	let link1 = port1.link<DefaultLinkModel>(port2);
	link1.getOptions().testName = 'Test';
	link1.addLabel('Hello World!');

	//4) add the models to the root graph
	model.addAll(node1, node2, link1);

	//5) load model into engine
	engine.setModel(model);

	//6) render the diagram!
	return (
		<DemoCanvasWidget>
			<CanvasWidget engine={engine} />
		</DemoCanvasWidget>
	);
};

[BuzzyLizzy]

I can additionally add that I am getting this error in the Chrome inspector:

Uncaught TypeError: Cannot read properties of null (reading 'getTotalLength')
    at LabelWidget.tsx:43:1
    at Array.map (<anonymous>)
    at LabelWidget.findPathAndRelativePositionToRenderLabel (LabelWidget.tsx:43:1)
    at LabelWidget.calculateLabelPosition (LabelWidget.tsx:67:1)

[BuzzyLizzy]

I found the problem, I wrapped the diagram inside this:
<React.StrictMode> .... the diagram ..... </React.StrictMode>
when I removed that it started working correctly.

[sovetski]

I found the problem, I wrapped the diagram inside this: <React.StrictMode> .... the diagram ..... </React.StrictMode> when I removed that it started working correctly.

This is not a good solution, you should keep it: https://react.dev/learn/keeping-components-pure#detecting-impure-calculations-with-strict-mode