AutoSize-Options not working

[torstent]

Using Svelte 3.52 and @revolist/svelte-datagrid 3.2.16 with below +page.svelte the autosize of the columns is not working

Does someone has an idea

<script>
    import {RevoGrid} from "@revolist/svelte-datagrid/src/svelte";
    import {defineCustomElements} from "@revolist/revogrid/loader";

    defineCustomElements();
	function generateHeader(index) {
		const asciiFirstLetter = 65;
		const lettersCount = 26;
		let div = index + 1;
		let label = '';
		let pos = 0;
		while (div > 0) {
			pos = (div - 1) % lettersCount;
			label = String.fromCharCode(asciiFirstLetter + pos) + label;
			div = parseInt(((div - pos) / lettersCount).toString(), 10);
		}
		return label.toLowerCase();
	}

	function generateFakeDataObject(rowsNumber, colsNumber) {
		const result = [];
		const columns = {};
		const all = colsNumber * rowsNumber;
		for (let j = 0; j < all; j++) {
			let col = j%colsNumber;
			let row = j/colsNumber|0;
			if (!result[row]) {
				result[row] = {};
			}
			if (!columns[col]) {
				columns[col] = {
					name: generateHeader(col),
					prop: col,
					autoSize: true
				};
			}
			result[row][col] = row + ':' + col+ "breitbreitbreit";
		}
		let headers = Object.keys(columns).map((k) => columns[parseInt(k, 10)]);
		console.log("headers", headers)
		return {
			source: result,
			headers
		};
	}

	let source;
	let headers;
	let autosizeOptions = { mode: 'autoSizeAll' }
	const data = generateFakeDataObject(100, 5);
	source = data.source;
	headers = data.headers;
	console.log("test")
</script>


<!-- https://revolist.github.io/revogrid/guide/autosize.html#column-autosize --> 
<RevoGrid source={source} resize="true" autoSizeColumn = {autosizeOptions} columns={headers} theme="material"/>

<style>
	revo-grid {
		height: 100vh !important;
	}
</style>

see https://stackblitz.com/edit/revogrid-sveltekit-example?file=src/routes/datagrid/+page.svelte