.moretag class for posts_morelink

Hello, it seems that once the more link came with a class of .moretag, I found it in the CSS of an older website of mine. Or maybe it was something else because the postlink is a bit newer i think. Can it be assigned a class as well in the output. I tried to assign it myself using

$this->get_posts_morelink($single, '', 'postmoretag');

but this doesn’t seem to work.

Thanks
Sofian

https://ww.wp.xz.cn/plugins/list-category-posts/