Reference list disappearing when I add a reference
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Needless to say, this is quite nerve-wrecking as you try to finish a 300 pages thesis...
Unless you've added uncited items, a Zotero bibliography in a document is just a representation of the citations that exist in the document. Even if the bibliography disappeared — which is very unlikely — why would you need to go back to an earlier version of the document? You could just reinsert a bibliography.
Note that, if you have "Automatically update citations" disabled, the bibliography will disappear when you insert a reference and be replaced by a message saying that it will reappear when you click Refresh. So if that's all you mean, that's perfectly normal behavior.
Reinserting the bibliography works sometimes, sometimes not.
I have not disabled "Automatically update citations".