Extra list item bullet when using HTML and attributedText in UITextView

We have an issue where UITextView displays bullets that do not exist in the HTML used for its attributedText. This happens when there is more than 1 nested list and other text content.

This displays correctly:

Heading 1
<ul>
    <li>
        Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
    </li>
</ul>
        
Heading 2
<ul>
    <li>
        Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
    </li>
    <li>
        Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </li>
</ul>

This displays with a bullet on Heading 2 as if it was a list item:

<ul>
    <li>
        Heading 1
        <ul>
            <li>
                Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
            </li>
        </ul>
        
        Heading 2
        <ul>
            <li>
                Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
            </li>
            <li>
                Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
            </li>
        </ul>
    </li>
</ul>

Any suggestions? Using a WKWebView works correctly, but some of these UITextViews are in tables and we don't want to tackle the row height issue when using a web view.