Populate acf-field, depending on block name

You are calling get_post() using null. Try to retrieve the post individually. Use get_post(get_the_ID()) to get the post content.

$post = get_post(get_the_ID());
if ( has_blocks( $post->post_content ) ) {
    $blocks = parse_blocks( $post->post_content );
    if ( $blocks[0]['blockName'] === 'acf/full-width-talker' ) {
  
    }
}

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)