Form submission not working when user is logged on Mautic

[rc125]

What type of report is this:

Q	A
Bug report?	Y
Feature request?
Enhancement?

Description:

Form submission not workinking when the user is logged on Mautic

If a bug:

Q	A
Mautic version	2.9.0
PHP version	7.0

Steps to reproduce:

1. Apply PR #4415
2. Create a Form
3. On Submit Action add "Modify contact's segments" and add the contact to a segment
4. Submit Form

Log errors:

[2017-07-17 20:42:39] mautic.CRITICAL: Uncaught PHP Exception Doctrine\ORM\ORMInvalidArgumentException: "A new entity was found through the relationship 'Mautic\LeadBundle\Entity\ListLead#lead' that was not configured to cascade persist operations for entity: Mautic\LeadBundle\Entity\Lead with ID #. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={"persist"})." at /var/www/mautic/vendor/doctrine/orm/lib/Doctrine/ORM/ORMInvalidArgumentException.php line 92

[escopecz]

I'll close this issue in favour of #4520 since its title describes the problem better.

[gingerling]

I don't think it's the same issue, I have been meaning to report this myself. I have found when I am logged in to mautic and test a form, the form throws a 404. It works okay in a private browsing session so it seems being logged in is the cause. I read some of the 404 thread and wasn't sure if it was related or not.

[gingerling]

To clarify, by "test a form" I mean fill one out. Applies to both mautic pages and forms embedded on other pages.