className is not changed to class attribute for custom elements in JSX

In one of my React components, I have the following definition for some custom elements:

declare global {
    // eslint-disable-next-line @typescript-eslint/no-namespace
    namespace JSX {
        interface IntrinsicElements {
            'd3fc-group': DetailedHTMLProps<HTMLAttributes<HTMLDivElement>, HTMLDivElement>;
            'd3fc-svg': DetailedHTMLProps<HTMLAttributes<HTMLDivElement>, HTMLDivElement>;
        }
    }
}

and I return as:

return (
    <div ref={d3Container} className='main_layout' data-testid={'chart'}>
        <d3fc-group
            id='group'
            className='hellooo'
            style={{ display: 'flex', height: '100%', width: '100%', flexDirection: 'column' }}
            auto-resize>
        </d3fc-group>
    </div>
);

But in the resulting html, "className" is converted to "classname" not "class" attribute.

<d3fc-group id="group" classname="hellooo" auto-resize="true" style="display: flex; height: 100%; width: 100%; flex-direction: column;"><div style="flex: 1 1 0%; display: flex; flex-direction: column;"></d3fc-group>

How to make it converted to "class" attribute like other components?