View from relationship, one side not displaying anything

I've got a relationship between two CPTs, on the Relationship UI, it's not marked as a Reciprocal relationship (left unchecked). On each post type edit page, the relationship appears and works without any issues.

Now, I'm trying to display CPT-A 'Projects' related to CPT-B 'Awards' on each frontend post.

Here's the view to be displayed in a Project, which is working just fine:

{% set args = {
    'post_type': 'award',
    'nopaging': true,
    'relationship': {
        'id': 'projects-and-awards',
        'from': post.ID,
        }
    }
%}
{% set awards = mb.get_posts( args ) %}

{% for award in awards  %}
    <p><a href="{{ award.url }}" alt="{{award.post_title}}">{{award.post_title}}</a></p>
{% endfor %}

And here's the view to be displayed in an Award, that's not displaying anything, as if the loop was empty (the view works, tried it by placing the {{post.id}} and some static strings):

{% set args = {
    'post_type': 'project',
    'nopaging': true,
    'relationship': {
        'id': 'proyectos-y-premios',
        'from': post.ID,
        }
    }
%}
{% set projects = mb.get_posts( args ) %}

{% for project in projects  %}
    <p><a href="{{ project.url }}" alt="{{project.post_title}}">{{project.post_title}}</a></p>
{% endfor %}

I'm not sure why on the Award post, it's not showing anything, however on the Project post it's working without any issue.