I've been trying to figure out why this is not stripping out any of the HTML

Code:
<mvt:comment>Strip any HTML from the product description.</mvt:comment>
<mvt:assign name="l.settings:product:stripped_descrip" value="miva_html_strip(l.settings:product:descrip, '')"/>
<meta itemprop="description" content="&mvte:product:stripped_descrip;" />
FWIW this doesn't have any HTML in it

Code:
<div class="x-flex-tabs__content" itemprop="description">
&mvt:product:descrip;
</div>
I wonder if it's a "Google thing"?