tRPC Optimistic Update Not Work

const { mutate, isLoading } = api.main.updateLikes.useMutation({
    async onMutate(newPost) {
      // Cancel outgoing fetches (so they don't overwrite our optimistic update)
      await ctx.main.getAll.cancel()

      // Get the data from the queryCache
      const prevData = ctx.main.getAll.getData()

      // Optimistically update the data with our new post
      ctx.main.getAll.setData({ limit: 25 }, (old) => {
        console.log(prevData) //Problem HERE, both prevData and old is undefined
        if (!old) throw "no old data"
        const updatedPosts = old.posts.map((post) =>
          post.id === newPost.postId ? { ...post, likedBy: [] } : post
        )
        const newObj = { ...old, posts: updatedPosts }
        return newObj
      })

      // Return the previous data so we can revert if something goes wrong
      return { prevData }
    },
    onError: (e, newPost, prevContext) => {
      ctx.main.getAll.setData({ limit: 25 }, prevContext?.prevData)
      const otherErrorMessage = e.message
      if (otherErrorMessage) toast.error(otherErrorMessage)
      else toast.error("unknown error")
    },
    onSettled() {
      // Sync with server once mutation has settled
      void ctx.main.getAll.invalidate()
    },
  })