https://github.com/ktorio/ktor/blob/main/ktor-client/ktor-client-okhttp/jvm/src/io/ktor/client/engine/okhttp/OkHttpEngine.kt#L153

This does not seem intentional. The dispatcher from the preconfigred okhttp client is ignored, and a new dispatcher is created, which is configured via engine { config { ... } }.
Is there a reason for this? Willing to contribute to fix this.