csharp SDK v4.0. Generated Code Contract Issue

[idukic]

ERROR: The given key 'client_id' was not present in the dictionary.

Trying to get c# example working, but struggling with auth.
Looking at the source code, there's an ApiSettings class that holds base URL, timeout and few other properties, but login code in AuthSession tries to read client id and secret from that type, and it doesn't contain those properties! Looks like generated code or contract is broken, maybe some mismatch between version 3 and 4?

AuthSession type:
https://github.com/looker-open-source/sdk-codegen/blob/main/csharp/rtl/ApiSettings.cs

Reading of key that doesn't exists:
https://github.com/looker-open-source/sdk-codegen/blob/main/csharp/rtl/AuthSession.cs#L140

var clientId = section["client_id"].ToString();

Would appreciate any help with this.