I'm trying to inherit a report template and hide a div element with a date. I achieved it using a t-if attribute but if I try to use invisible attribute is not working. Any idea why is this happening?

<xpath expr="//div[@name='div_sched_date']" position="attributes">
   <attribute name="invisible">o.state == 'waiting' /attribute> NOT WORKING
   <attribute name="attrs"> {'invisible': [['o.state','==','En Espera']]} /attribute> NOT WORKING
   ​<attribute name="t-if">o.state in ('confirmed', 'shipped', 'done') /attribute> WORKING
</xpath>

Thanks a lot.