AntiCompositeNumber’s report for huwiki lists the following signature as not having a user/user talk link (the user page is Szerkesztő:HoremWeb):
[[kép:horemweb.png|HoremWeb|link=Szerkesztő:HoremWeb]] <sup>[[kép:dd-mdw-jn.png|14px|ḏd md.w jn: szavaknak mondása|link=Szerkesztővita:HoremWeb]]</sup>
Is this invalid according to MediaWiki as well, or it’s just the Toolforge tool that doesn’t recognize it? The resulting HTML has a proper <a>
tag in it, so I don’t think that the reply tool (or any other tool) should have issues with it.