Pipeline Server fails to start in a virtual player when Multiplayer Play Mode is used with a fixed Pipeline Server port

How to reproduce:

1. Create a new project
2. Open the Package Manager window (Window > Package Manager)
3. Click + > Install package by name and type "com.unity.multiplayer.playmode"
4. Click + > Install package by name and type "com.unity.pipeline"
5. Click Window > Pipeline > Settings...
6. In the Inspector window, on the EditorPipelineManager asset, set Port to 37211 and enable Auto Start
7. Close and reopen the project
8. Open the Multiplayer Play Mode window (Window > Multiplayer > Multiplayer Play Mode)
9. Enable Player 2 and wait for the virtual player to launch
10. Observe the Player 2 Console window

Actual result: "Failed to start Pipeline Server: Address already in use" error is logged
Expected result: No error is logged

Reproducible with: 0.2.0-exp.2 (6000.7.0a6), 0.6.0-exp.1 (6000.7.0a6)

Reproducible on: macOS 26.6.2 (M1 Max)
Not reproducible on: No other environments tested

Note: The port doesn't have to be 37211, any free port will work