Single Image - Custom Post Type - No Data

Hey,

i've created a view and everything is working so far. The only problem is that I can't get any data for a custom field (single image), all other fields work strangely and I don't know where the error comes from. See code and screenshot:

{% set args = { post_type: 'mitarbeiter', posts_per_page: -1 } %}
{% set posts = mb.get_posts( args ) %}
{% for post in posts %}

<div class="sec-mitarbeiter-container">
    <img class="sec-mitarbeiter-image" src="{{ post.mitarbeiter_profilbild.full.url }}" alt="{{ post.mitarbeiter_profilbild.full.alt }}" title="{{ post.mitarbeiter_profilbild.full.title }}">
    <p class="sec-mitarbeiter-name">
        {{ post.post_title }}
    </p>
    <p class="sec-mitarbeiter-title">
        {{ post.mitarbeiter_titel }}
    </p>
    //more Code here, but deleted, don't want to expand the post further
    <a class="sec-mitarbeiter-social-link" target="_blank" href="{{ post.mitarbeiter_linkedin_link }}" rel="noopener"> {{ post.mitarbeiter_linkedin_link }}</a>
</div>
{% endfor %}

<div class="sec-mitarbeiter-container">
    <img class="sec-mitarbeiter-image" src="{{ post.mitarbeiter_profilbild.full.url }}" alt="{{ post.mitarbeiter_profilbild.full.alt }}" title="{{ post.mitarbeiter_profilbild.full.title }}">

Isn't working, see screenshot:
https://ibb.co/1TJhYS0