We've recently come across an issue where the text-decoration of an underline in an anchor tag appears strange when there is a sup element present. The visual glitch looks like this: https://i.sstatic.net/X2Yqg.png
For reference, here's the HTML structure we are working with:
<li>
<a>
<p>Some Text
<span>
<sup>
<span>
<strong>®</strong>
</span>
</sup>
</span>
</p>
</a>
</li>