A new Additive Scene cannot be created when an empty Untitled Scene is not dirty

How to reproduce:
1. Delete every Scene from the “Test_UntitledScene.zip“ project (to open the “Untitled“ Scene on launch)(if there are any)
2. Open the “Test_UntitledScene.zip“ project
3. Select the “Do Something That Is Impossible When There Is An Untitled Non Saved Scene“ submenu in the “Test” menu (to add a new scene additively)
4. Observe the Console window

Expected results: Scene is created and no Console errors appear
Actual results: Scene is not created and an “InvalidOperationException“ error appears

Reproducible in: 2021.3.37f1, 2022.3.26f1, 2023.2.19f1, 6000.0.0b16

Reproduced on: Windows 11 Pro (23H2), macOS 14.4.1 (by the reporter)
Not reproduced on: No other environment tested

Note: The method “EditorSceneManager.EnsureUntitledSceneHasBeenSaved“ does not account for the “Dirty“ state not being set, resulting in the Scene being considered “unsaved”