Sorry for hijacking this topic, but this issue seems to be related to my problem. We’re creating a custom blog post template, which has related blog posts displayed under the content. The related posts are displayed using the tag related_blog_posts. Otherwise it works fine, but just like in the previous example, post.comment_count is always zero and post.comment_list is an empty array.
I guess I can use content_by_id() if this is by design.