Takashi Murakami

If you are not logged in, it will not hide the current public posts. ( Only one generation, but allows the future of the article published. ) 
公開記事を更新（予約投稿）した状態であっても、..訪問者が予約投稿前の記事を閲覧できるようになる

Fixed Future Posts

Plug-in ( Fixed Future Posts ) for the WordPress.

oktopost

If you ever tried including a link, in your social content, to a scheduled blog post, this small but precious time saver is for you.
The Oktopost Future Posts plugin allows <a href="https://www.oktopost.com" rel="nofollow ugc">Oktopost</a> to read the content of scheduled blog posts and create link attachments as it would normally do with published blog posts.
Once installed the plugin requires zero configuration. Just copy and paste the link to the designated blog post from WordPress to the Oktopost message box and the link attachment will show up as-always.

Oktopost Future Posts

Easily include link attachments, in your social content, to blog posts that have not yet been published.

Fixed Future Posts vs Oktopost Future Posts