get_post_thumbnail does not display thumbnail

Make sure to use echo with get_the_post_thumbnail():

echo get_the_post_thumbnail(64 , 'post-thumbnail', array( 'class' => 'img-format-big' ) );

In WordPress, a rule of thumb (no pun intended) is to use echo with functions prefixed with get_. Functions prefixed with the_ on the other hand, display their output immediately (e.g. the_post_thumbnail() ).

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