Laravel 5.2 to 5.3 Upgrade "scoping" issue

I upgraded from 5.2 to 5.3 and ran into a strange issue. When I render a view from a controller passing 2 objects, $prospect and $patient, then do a Form::open() with the following code.

{!! Form::open(['method'=>'POST', 'action'=>['ProsController@patientUpdate']]) !!}

{!! Form::close() !!}

The $prospect->id is populated by the $patient->id

If I change

to

<input type="hidden" name="id" value="" />

Everything is fine... is it somehow binding to the form without using Form::model() ?

I have no idea what is up, I have this issue in 2 places where the same form is shared, I am trying to determine if this is something to do with pulling the form in with ajax, but it worked fine in Laravel 5.2

via Chebli Mohamed