A simple plugin to update preview links on WordPress. This doesn't exactly update the preview links but it actually update permalinks for drafts. The filters preview_post_link and preview_page_linka used to work but it is no longer supported on WordPress Gutenberg. See this issues here:
I supposed there is a way to make it work with Gutenberg but ain't nobody got time for that! If you have a better solution for this, feel free to contribute <3
Edit wp-preview-link-update.php and change localhost:3000 to your WP site url and your.site.com to your previewing site url.