Edited style not shortening footnotes

Hi, I have made a small edit to the Australian Guide to Legal Citation style, adding a History field to legislation citation so that I can display treaty accession dates, etc. I have saved it as a new style but now that style does not display short form footnotes for subsequent citations (of books, journal articles, etc), i.e. it cites the full reference every time. I'm a novice at style editing; is there something I have neglected to do here? Thanks!
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