[jenny]

Here is your modify template-posts-container.php temaplte code, You should try

<div id="posts-container">
    <?php foreach ($custom_posts as $post): setup_postdata($post); ?>
        <h2><?php echo esc_html(get_the_title($post)); ?></h2>
        <div class="post-content"><?php echo wp_kses_post(get_the_content(null, false, $post)); ?></div>
    <?php endforeach; wp_reset_postdata(); ?>
</div>

setup_postdata($post) to set up global post data. This allows you to
use template tags like get_the_title() and get_the_content().
get_the_title($post) and get_the_content(null, false, $post) are used
to fetch the title and content of each post.

[Author]

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