Zotero error 1921633966. On restart a collection disappeared
Second time this happened. First time the collection name was Word
I somehow was able to recover the content and put it into a collection WordB
Now this collection disappeared
I somehow was able to recover the content and put it into a collection WordB
Now this collection disappeared
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Invalid collection nesting should be prevented by this error, but if it somehow happened regardless, you should be able to fix it by checking your database integrity from the Advanced → Files and Folders pane of the Zotero preferences.