UPM related errors are thrown for MPPM's Virtual Player after starting the Player

Steps to reproduce:

1. Open the attached project
2. Open the SampleScene
3. Start one of the Virtual Players in the Multiplayer Play Mode window
4. Observe the Console window for the Virtual Player

Actual results: UPM-related errors are thrown every time a Virtual Player is started

Expected results: No errors or warnings are thrown when starting a Virtual Player in an empty scene

Reproducible with versions: 6000.3.20f1(2.0.2), 6000.5.4f1(2.0.2), 6000.6.0b3(3.0.0), 6000.6.0b4(3.0.0), 6000.7.0a2(3.0.0)

Not reproducible with versions: 6000.0.79f1 (1.6.3), 6000.3.19f1 (2.0.2), 6000.5.3f1(2.0.2), 6000.6.0b2_de66c00feac7(3.0.0), 6000.7.0a1(3.0.0)

Tested on (OS): macOS 26.5.1, Ubuntu 24

Notes:

• Thrown errors are clearable, but are thrown every time a Virtual Player is started
• Warnings thrown on 6000.6 and 6000.7 before the regression point for each stream are not present on earlier streams

Full error messages:

• [Package Manager Window] Error fetching package list.
  UPM server is not running
• [Package Manager Window] Error fetching package list offline.
  UPM server is not running