I know I may be a little late to the party but I believe that I found a solution to this. Maybe something that was added to an update since last this was reviewed, but I did the following to get a specific field that is from a block on another post.
$postBlocks = parse_blocks($post->post_content); print_r($postContent); // Displays array of all blocks $postContent = $postBlocks['attrs']['data']['custom_field_slug']; // Example echo $postContent;
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