count（）：参数必须是数组或实现Countable的对象 - phpWord

I am trying to output html to word using phpWord. However, something is weird. It works fine for the following code:

$content = '';
    $content .= '<table><tr><th>Header</th><td>Content</td></tr></table>';
    $content .= '<ul><li>Bullet</li><ul><li>Bullet</li></ul></ul>';
    $content .= '<ol><li>Bullet</li></ol>';
    Html::addHtml($newSection, $content);

But does not work for this:

 $content = '';
    $content .= '<table><tr><th>Header</th><td>Content</td></tr></table>';
    $content .= '<p>Bullet</p>';
    $content .= '<p>Cat</p>';
    Html::addHtml($newSection, $content);

and produces the error mentioned on the title.

UPDATE

This error is generated from this file: \vendor\phpoffice\phpword\src\PhpWord\Shared\Html.php

In this method:

 private static function parseChildNodes($node, $element, $styles, $data)
{
    if ('li' != $node->nodeName) {
        $cNodes = $node->childNodes;
        if (count($cNodes) > 0) {
            foreach ($cNodes as $cNode) {
                if ($element instanceof AbstractContainer) {
                    self::parseNode($cNode, $element, $styles, $data);
                }
            }
        }
    }
}

But it only happens when using the <p> html tag and it's fine with all other tags.

I also came across this link: addHtml() does not support tags inside list tags. #521