在某个返回值上停止Kotlin流

fun uploadProjectData(contactId: String, projectId: String) = flow<Resource<Boolean>> {
        emit(test1(contactId, projectId))
        emit(test2(contactId, projectId))
        emit(test3(contactId, projectId))
    }.onEach {
        if (it.errorCode != 0) {
            return@onEach
        }
        delay(0)
    }.flowOn(
        Dispatchers.IO
    )

    suspend fun test1(contactId: String, projectId: String): Resource<Boolean> {
        // api call or DB operation
        return responseHandler.handleSuccess(true, "test1 Successful")
    }
     
    suspend fun test2(contactId: String, projectId: String): Resource<Boolean> {
        // api call or DB operation
        return responseHandler.handleError(999, "test2 Unsuccessful")
    }

    suspend fun test3(contactId: String, projectId: String): Resource<Boolean> {
        // api call or DB operation
        return responseHandler.handleSuccess(true, "test2 Successful")
    }

尽管test2()返回999个错误代码,但执行不会停止,它也会执行test3()。这个代码有什么问题?如何解决?