This trait conflicts with the HtmlTrait. If both are used together,
you have to define a resolution, by defining the HtmlTrait::parseInlineHtml
as private so it is not used directly:

use block\HtmlTrait {
    parseInlineHtml as private parseInlineHtml;
}

If the method exists it is called internally by this trait.

Also make sure to reset references on prepare():

protected function prepare()
{
    // reset references
    $this->references = [];
}