Only loads first batch of table rows.

I just found and tried this little lib, but can't get it to work properly. Here's the thing:

I have an array of 1000 strings of this type:

const rowsArr=['<tr><td class=\"fileUrl\"><img src=\"blob:file:///3ac975e4-355d-4bc5-8c6e-bfc8a3c4a9a9\" /></td><td class=\"lastModified\">1575994775000</td><td class=\"name\">1.png</td><td class=\"size\">1.67 kb</td><td class=\"type\">image/png</td></tr>', ...]

I put this into a table (which is 300px high and lives somewhere in my browser window (not full-width/height).

Here's the HTML:

<table>
    <tbody class="ttscroller" class="clusterize-content">
    </tbody>
</table>

The library only renders the first batch of lines (approx 58) of <tr> and then stops. No matter if I scroll down or not, there are only approx 58 rows drawn/loaded.

This is all code:

function stringToHTML(html) {
    var template = document.createElement('template');
    template.innerHTML = html.trim();
    return template.content.firstChild;
}

function renderMessage(message) {
    return stringToHTML(message);
}

const vsoptions = {
    estimatedItemHeight: 51,
    bypass: false
}

const virtualScroller = new VirtualScroller(
    document.querySelector(".ttscroller"),
    rowsArr,
    renderMessage,
    vsoptions
);

I'm using this DOM-lib from 'unpkg': https://unpkg.com/virtual-scroller@1.x/bundle/virtual-scroller-dom.js

BTW: If I add window.VirtualScrollerDebug = true; and throw my 1000 rows at the library, my machine gets unuseable for a while and the CPU-load jumps to around 100% (on a 6-core MacBookPro 2018).

I hope that was detailed enough for you to reproduce.

andy