AppAuth-iOS: INVALID_ARGUMENT errors showing up

I’m not sure if this is related to issue #288 but I’m now seeing this all of a sudden on an app that’s been unchanged for a few months. Notice the %20 in the scope below, could this be tripping Google up again? Can someone please get Google to stop making these changes without thinking through? This is the third time in 12 months that our apps have stopped working all of a sudden.

OAuth: request failed: <OIDTokenRequest: 0x6100008b6200, ClientID: 506211136043-6tslfe4ok4ib6faeh9i07qgo1f39uenr.apps.googleusercontent.com, Secret? 24 Scope: email https://www.googleapis.com/auth/carddav, Grant: refresh_token, request: <URL: https://www.googleapis.com/oauth2/v4/token, HTTPBody: grant_type=refresh_token&scope=email%20https://www.googleapis.com/auth/carddav&refresh_token=1/G3BaNEf4R0QiP3O-8lmP1nxz0xW8KmKlSmlgvvuMsEC&client_id=503211136043-6tslfe4ok4ib6faeh9i02qgo1f39uenr.apps.googleusercontent.com&client_secret=OgHS5U0O5dVn0i96t1acNk1e>> (<NSMutableURLRequest: 0x618000015ca0> { URL: https://www.googleapis.com/oauth2/v4/token }) => <NSHTTPURLResponse: 0x60000063f380> { URL: https://www.googleapis.com/oauth2/v4/token } { status code: 400, headers {
    "Cache-Control" = private;
    "Content-Encoding" = gzip;
    "Content-Length" = 129;
    "Content-Type" = "application/json; charset=UTF-8";
    Date = "Wed, 26 Sep 2018 22:44:56 GMT";
    Server = ESF;
    Vary = "Origin, X-Origin, Referer";
    "alt-svc" = "quic=\":443\"; ma=2592000; v=\"44,43,39,35\"";
    "x-content-type-options" = nosniff;
    "x-frame-options" = SAMEORIGIN;
    "x-xss-protection" = "1; mode=block";
} } (server error: Error Domain=org.openid.appauth.remote-http Code=400 "{
  "error": {
    "code": 400,
    "message": "Request contains an invalid argument.",
    "status": "INVALID_ARGUMENT"
  }
}
" UserInfo={NSLocalizedDescription={
  "error": {
    "code": 400,
    "message": "Request contains an invalid argument.",
    "status": "INVALID_ARGUMENT"
  }
}
})
2018-09-26 15:44:56.301 -2- OAuth: underlying json error: {
    error =     {
        code = 400;
        message = "Request contains an invalid argument.";
        status = "INVALID_ARGUMENT";
    };
}