* fix
This fixes the issue where the currently active scene, on the server side, is not taken into consideration as being a valid "loaded scene" which can cause issues as outlined in GitHub issue #2722.
* fix: TestHelpers
This resolves an issue with integration testing where:
- the scene handler registration was being registered multiple times
- the server registration was not passing in true to NetcodeIntegrationTestHelper.RegisterHandlers
- the IntegrationTestSceneHandler.CoroutineRunner could get destroyed if the active scene it was instantiated within was unloaded (now it is migrated to the DDOL)
- Registration of the currently active scene during the scene handler registration was adjusted to no longer use NetworkSceneManager.GetAndAddNewlyLoadedSceneByName (but still registers the scene).
* test
Added an integration test: `NetworkSceneManagerFixValidationTests.InitialActiveSceneUnload`
This validates the fix for #2722.
* update
Adding change log entry for this fix.
1701474880