Any link is visible in post preview despite of case in protocol section. But only links where protocol in lowercase are visible in result.
- Here is the link with uppercase letter in protocol section: (visible only in preview mode, just click on "edit" under the post to see)
- Here is the link with all lowercase letters in protocol: http://google.com (visible everywhere)
Both links are actually refer to the same site.
Original bug report was reported on ruSO: Различие в парсинге ссылок браузером и сервером