i did the same mistake and restored to a previous version but there was too many changes that i did within this time. I am french and my english is not that good. I was just hoping to unlink citations from my bibliography so the references would not change from the presentation i manually did. Got my all document unlinked. Now the message keeps popping that my citations are unlinked but what is the use if zotero cannot provide help to restore them? How frustrating. Let me know if a solution was found since apart restoring to a former version which doesnt work for me.

Oh ok thanks for your answer. So that might mean that I eventually restored to a previous version but since I always have this message with a long list of citations that are unlinked I thought they were all unlinked. If there's only a portion of them unlinked, it this a different situation and is it possible to relink them ?

https://www.zotero.org/support/kb/google_docs_citations_unlinked

This doesn't have anything to do with the Unlink Citations option.