How to reproduce:
1. Create a new Unity project
2. Go to Window -> Multiplayer -> Multiplayer Center
3. In the Multiplayer Center, Casual co-op -> Select
4. In the "Get Started" tab, install the "QuickStart" page
5. Observe the Console

Expected results: No errors are thrown
Actual results: NullReferenceException is thrown

Reproducible with: 2.0.0 (6000.6.0a5)
Can't test with: 1.0.1 (6000.5.0b7) (Different design)

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested

Note: Not 100% consistent but I have got reproduction across a few new projects

First lines of error: [Worker0] NullReferenceException: Object reference not set to an instance of an object
Unity.Multiplayer.PlayMode.Editor.MainEditorController.SetupExecutionGraph (Unity.Multiplayer.PlayMode.Editor.ExecutionGraphBuilder graphBuilder) (at /Users/bokken/build/output/unity/unity/Modules/MultiplayerEditor/Managed/MultiplayerPlayMode/Scenarios/Instances/MainEditorController.cs:48)