等了很久，但找不到答案。。。我发现了问题，但不知道如何解决。但幸运的是，有一条路可以绕过它。

我一直在用wordpress的pre_get_posts 挂钩以设置tax_query 如下所示：

add_action( \'pre_get_posts\', \'homeInjector\' );

function homeInjector( $query ) {

        if ( $query->is_home() ) {

            $issues = get_terms( array(
                \'taxonomy\' => \'issues\'
            ) );

            if ( isset( $_POST[\'issue\'] ) ) {
                $term = $_POST[\'issue\'];
            } else {
                $term = $issues[0]->slug;
            }


            $arg = array(
                array(
                    \'taxonomy\' => \'issues\',
                    \'terms\'    => $term,
                    \'field\'    => \'slug\'
                )
            );

            $query->set( \'tax_query\', $arg );

        }

$issues = get_terms( array(
    \'taxonomy\' => \'issues\'
) );

if ( isset( $_POST[\'issue\'] ) ) {
    $term = $_POST[\'issue\'];
} else {
    $term = $issues[0]->slug;
}

$qry = new WP_Query( array(
    \'post_type\' => \'post\',
    \'tax_query\' => array(
        array(
            \'taxonomy\' => \'issues\',
            \'terms\'    => $term,
            \'field\'    => \'slug\'
        )
    )
) );

但我还是会等待合适的答案，因为我的答案只是帮助我和其他人的一种方式：）