LibreOffice uses liborcus in various places. There are plenty of bugs in LibreOffice related to Orcus, especially those related to CJK, CTL, encoding etc.
This is a meta bug tracking the libreoffice bugs related to Orcus. These bugs should first be reported to Orcus issue tracker (by our QA people, not by the normal bug reporter). These bugs should not be closed until the issue is fixed in Orcus and the libreoffice orcus version is updated and tested or a patch is submitted in LibreOffice code base.
Orcus issue tracker is in: