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Optimistic updates not working tRPC useQuery

So I'm currently trying to implement an optimistic data update with tRPC. I'm following the docs. So far if I just do

onSetteled

onSetteled

it works fine and the data refetches after a second or two. Now I'm trying to implement the onMutate portion, and for some reason my

queryClient.getQueryData()

queryClient.getQueryData()

returns undefined, even though I'm passing it the same query that I pass invalidateQueries. Any insight on what I might be missing with the syntax?