Gutenberg Block: How to reload a ServerSideRender?

I solved it with an “update” button in the block. It is a bit weird because I need to send “fake” attributes to re-render it. But it works.

var el = wp.element.createElement;
var registerBlockType = wp.blocks.registerBlockType;
var BlockControls = wp.blockEditor.BlockControls;
var ServerSideRender = wp.serverSideRender;
var Toolbar = wp.components.Toolbar;
var IconButton = wp.components.Button;

function sendfakeAttribute(props) {
        // this actually triggers the ServerSideRender again ¯\_(ツ)_/¯
        props.setAttributes({ updated: Date.now() });
}

registerBlockType( 'simpletoc/toc', {
    title: __( 'SimpleTOC', 'simpletoc' ),
    icon: listul,
    category: 'layout',
    edit: function( props ) {

                    return [
                            el(
                                BlockControls,
                                { key: 'controls' },
                                el(
                                    Toolbar,
                                    null,
                                    el(
                                        IconButton,
                                        {
                                            className: 'components-icon-button components-toolbar__control',
                                            label: 'update',
                                            onClick: function() { sendfakeAttribute(props) },
                                            icon: 'update'
                                        }
                                    )
                                )
                            ),
                            el(
                                ServerSideRender,
                                {
                                    block: props.name,
                                    attributes: props.attributes
                                }
                            )
                        ];


    },
    save: props => {
        return null;
    },
} );