Oscola - unattributed works in bibliography

In Oscola, chapter 1.7 (5th edition) Bibliographies, is says that ... "the titles of unattributed works should be preceded by a double em-dash. Works should be arranged in alphabetical order of author surname, with unattributed works being listed at the beginning of the bibliography in alphabetical order of first major word of the title."
This rule was also in the 4th edition but never worked in Zotero. Can someone please take a look at it.
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