User role/permissions are not updated in Symfony after assigning the user object to a different group, through legacy Admin UI.

steps to reproduce:

• optional: create a custom 'testmodule' module with a 'testfunc' function

  Module = array( 'name' => 'eZ Test' );
  $FunctionList = array(
      'testfunc'    => array()
  );
  

• optional: create a custom controller view to verify access and configure necessary routing. sample code:

          public function testAction( )
          {
              $grantStr = $this->getRepository()->hasAccess( 'testmodule', 'testfunc' ) ? 'granted' : 'NOT granted';
              return new Response( 'Access to testmodule/testfunc is: ' . $grantStr );
          }
  

1. In the backoffice, grant this policy to the 'editors' role and save.
2. In the frontend login as editor, access the view configured above.
   1. Verify that response is: "Access to testmodule/testfunc is: granted"
3. In the backoffice, move the editor user to the 'Anonymous group'
   1. In the frontend refresh the page: response is still granted.
4. Clear cache in admin backoffice
   1. frontend response is now "NOT granted"

The same problem exists when assigning back to a group with permissions.