EditorSceneManager using SceneManager in Play mode test

I would need to use EditorSceneManager to load the scene for play mode unit test. I need to use this one and not SceneManager.Load since I cannot have the scene in Build settings. The documentation about EditorSceneManager is clear that it is supposed to do what I need.

    protected void LoadScene(string sceneName, Action onComplete)
    {
        if (string.IsNullOrEmpty(sceneName)) { Debug.LogError("Missing scene name"); return;}
        UnityEditor.SceneManagement.EditorSceneManager.LoadScene(sceneName);
        //...
    }

I get error that the scene is not in the build settings as if SceneManager.LoadScene was called instead of the editor version.

Compiler also suggests to simplify to the following that I do not want to use:

 UnityEngine.SceneManagement.SceneManager.LoadScene(sceneName);

though I have no directives that could confuse the code:

using System;
using System.Collections;
using UnityEditor;
using UnityEngine;

I was using a side solution with IPrebuildSetup, IPostBuildCleanup to add/remove the scene via the AssetDatabase and EditorBuildSettingsScene and it works. But it also runs the scene loading/unloading process in Jenkins while building the prod app. I need to avoid that since it could lead to shipping assets that are only used in test scenes.