Nested conditional placeholders doesn’t work

Hi,
I’m trying to use nested conditional placeholders and it seems doesn’t work for me.
I inserted a line in wp-config-php
define('EM_CONDITIONAL_RECURSIONS',2);
this is the code I added in the single event page:

{has_bookings}
	<h1 class="entry-title">Come partecipare all'evento</h1>
	{logged_in}
		some text
	{/logged_in}
	{not_logged_in}
		other text
	{/not_logged_in}
	#_BOOKINGFORM
{/has_bookings}

If I try the conditional placeholders not indented, it works.
Any idea?
Thanks!
Stefi