[jeroenheijmans]

Thanks for logging this issue. I had the same problem. I’ve solved it without PHP, just jQuery.

For what it’s worth, here’s what it looks like:

<script>
jQuery(document).ready(function() {
    if (jQuery('#bbpress-forums')) {
        jQuery('.current_page_parent').toggleClass('current_page_parent').next().toggleClass('current_page_parent')
    }
});
</script>

It deselects the “current page” and selects the next one (which is the forum page, for me) as current. But only if #bbpress-forums is on the page.

I’ve added this to the footer.php file of my theme (GeneratePress), just before the </body> statement.

Hackish, but given that it’s noted as a bug it’ll do for now.