I just realized my code was garbled when pasting. The correct code is:
<a href="<?php echo esc_url($link_url); ?>" target="<?php echo esc_attr($link_target); ?>" role="link"
aria-description="<?php echo esc_html($link_title); ?>" class="<?php echo $className; ?>">
<InnerBlocks allowedBlocks="<?php echo esc_attr(wp_json_encode($allowed_blocks)) ?>" />
</a>
