LibreOffice released Emoji and in-word replacement support since 5.0 version.
For example, in traditional Chinese we translate "registered" string wich is ® (U+000AE) in extras/source/autocorr/emoji.po as "註冊商標". It is expected AutoCorrect can replace the text of :註冊商標: in Chinese (traditional) locale to ® emoji symbol. However, AutoCorrect does not work for traditional Chinese in this case.
1. Type or cut and paste :註冊商標: to Writer
2. press Enter to expect AutoCorrect to work and replace :註冊商標: to ®
Nothing happened. :註冊商標: is still :註冊商標:
:註冊商標: should be replaced with ® like :registered: does.
Thanks for reporting this is issue.
It seems like a dupe of bug 93846 to me.
*** This bug has been marked as a duplicate of bug 93846 ***