Original parent theme name is disclosed (bug report)

The original parent theme name is disclosed on the info box "This theme is based on [Parent-theme]" (the customized name is expected, but the original parent theme name is disclosed instead).

I've temporarily "fixed" this using this code snippet (I've used "Code Snippets plugin, network activated, so it works on entire network, without need to edit every available theme functions.php):

-----
function remove_parent_theme_infobox() {
echo "
<style>
.theme-overlay .parent-theme {display:none;}
</style>";
}
add_action('admin_notices', 'remove_parent_theme_infobox');
-----

Looking for a definitive solution (the customized parent theme name to be shown).

Thanks!