I think we may have fixed this 3 weeks ago: https://github.com/pgdogdev/pgdog/pull/744

Might be worth another try. If not, a GitHub issue with more specifics would be great, and we'll take a look. Also, if binary encoding isn't working out, try using text - it's more compatible between Postgres versions:

    [general]
    resharding_copy_format = "text"