NullReferenceException error is thrown when pinging the "Initial Scene" in the Play Mode Scenarios window

How to reproduce:
1. Create a new Unity project
2. Go to Window -> Multiplayer -> Multiplayer Center
3. Run the setup process (Casual co-op -> Select)
4. Install the "Multiplayer QuickStart" package -> Import
5. In the Unity toolbar, click Default -> Configure Play Mode Scenarios -> PlayerConnection -> Initial Scene
6. Ping the "Example" scene and observe the Console

Expected results: No errors are thrown
Actual results: "[Worker1] NullReferenceException: Object reference not set to an instance of an object" error is thrown

Reproducible with: 3.0.0 (6000.6.0a7)

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

Note:

• Can't test other versions because the issue seems to be inconsistent even though I have reproduced it across the two new projects

First lines of error:

[Worker1] 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)