isOpen or isActive in menu Nesting level too deep - recursive dependency?

When adding an isOpen or isActive to a subpage menu item in a menu, I get a PHP error.

Nesting level too deep - recursive dependency? in …/kirby/core/page.php on line 757

isOpen or isActive works on the root level menu items. I have removed the code to get my site working in the meantime.

Any thoughts?

Using Kirby 2.0.6.
Using multi-language site

Took the isActive/isOpen out of the foreach loop.

old
foreach($items as $p) …
$p->isActive()

changed to
foreach($items as $p) …
$page->isActive()

Appears to be working.

Are you referring to your own code or is the core code or any documentation wrong?

I had a custom menu that included root links and one subpage link.

$items = $pages->find('link1', 'link2', 'link2/link2.1' );
if($items && $items->count() > 0): 
$n = 0;foreach($items as $p): $n++;
<li class="<?php echo ($n%2) ? 'left' : 'right' ?>"><a<?php echo ($p->isActive()) ? ' class="active"' : '' ?> href="<?php echo $p->url() ?>">
<?php echo html($p->title()) ?></a></li>
<?php endforeach ?>
<?php endif ?>      

When the menu generated the isActive for link2/link2.1, i would get

Fatal error:  Nesting level too deep - recursive dependency? in <b>../kirby/core/page.php</b> on line <b>757</b>

I ended up pulling the subpage out of the loop and added it after the menu.I did a check for the slug to get it to work.

<li class="right"><?php $c = $pages->children()->findBy('uid', 'link2.1'); ?><a  
      <?php if ($page->slug() == 'link2.1') { echo 'class="active"'; } ?>  
      
      href="<?php echo $c->url() ?>"> <?php echo html($c->title()) ?></a></li>