Yes, here are similar threads. And I’m sure I saw a similar thing at least 3-4 times now, with different wording, so I can’t find them quickly:
Hopefully some of the discussion there might help. I suggest BACKING UP first of all. Make a copy of your vault.
And then maybe move your vault outside of iCloud while attempting to clean up any duplicate files, so they don’t continue to duplicate. Otherwise I don’t think anyone has ever followed up and confirmed this worked for them. So backup, and if it works, please let us all know!