How to fix a bug with InMemoryCache so as not to lose the results of previous queries in GraphQL?

Question

React

In a React application, I did an infinite scroll requesting data from a GraphQL query. But he incorrectly implemented caching of previous loaded results, as a result of which, when scrolling, new results are not added to previously loaded ones, but replace them.
I use Apollo, did according to their documentation, but I can't figure out InMemoryCache.

This is what the query looks like:

export const getEmailsQuery = gql`
  query GetEmails($offset: Int, $limit: Int) {
    getEmailAccounts(userInput: { offset: $offset, limit: $limit }) {
      id
      userId
      email
      dateCreated
      dateUpdated
    }
  }
`;

const [offset, setOffset] = useState(0);   // прибавляю offset после каждой прокрутки до конца экрана

  const {
    data: emailsData,
    loading: emailsDataLoading,
    fetchMore: emailsFetchMore,
    refetch: emailsRefetch,
  } = useQuery(getEmailsQuery, {
    variables: {
      offset,
      limit: 20,
    },
  });
 
  const cache = new InMemoryCache({
    typePolicies: {
      GetEmails: {
        fields: {
          getEmailAccounts: {
            keyArgs: [],
            merge(existing, incoming, { args: { offset }}) {
              const merged = existing ? existing.slice(0) : [];
              for (let i = 0; i < incoming.length; ++i) {
                merged[offset + i] = incoming[i];
              }
              return merged;
          }
        }
      }
    }
  }});

    const handleScroll = async () => {
      if (window.innerHeight + document.documentElement.scrollTop !== document.documentElement.offsetHeight) return;
      await emailsFetchMore({
        variables: {
          offset
        },
        updateQuery: (prev, { fetchMoreResult }) => {
          if (!fetchMoreResult) return prev;
          return Object.assign({}, prev, {
            feed: [...prev.feed, ...fetchMoreResult.feed]
          });
        }
      });
      setOffset(offset + 20);
    };

    useEffect(() => {
      window.addEventListener("scroll", handleScroll);
      return () => window.removeEventListener("scroll", handleScroll);
    }, []);

displaying results

{emailsData &&
          emailsData.getEmailAccounts.map((e, i) => (
...
          ))}

If I do console.log(cache), then I don't find any data in it.

Tell me where I went wrong.