Cant Unmarshal Exchange refresh token to type tokenJSON struct in v0.10.0

[fusesuphasin]

This is true ?
When i request to Exchange token with auth code

in /token/internal.go line 240
body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1<<20))
r.Body.Close()
if err != nil {
return nil, fmt.Errorf("oauth2: cannot fetch token: %v", err)
}

the output is
{
"access_token": ",
"expires_in": 3594,
"scope": ",
"token_type": "Bearer",
"id_token": ""
}

but the type tokenJSON struct in line 281 is
type tokenJSON struct {
AccessToken string json:"access_token"
TokenType string json:"token_type"
RefreshToken string json:"refresh_token"
ExpiresIn expirationTime json:"expires_in" // at least PayPal returns string, while most return number
// error fields
// https://datatracker.ietf.org/doc/html/rfc6749#section-5.2
ErrorCode string json:"error"
ErrorDescription string json:"error_description"
ErrorURI string json:"error_uri"
}

this is the reason why cant unmarshal to struct and not see the refresh token when Exchange.

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If I'm wrong, please give me the right reasons. Thank you.