"Do not use ReadObjectThreaded on scene objects!" repeatedly printed to the Editor log when attempting to open a specific project

How to reproduce:

1. Open the attached project “IN-139640”
2. Observe the Editor’s memory usage in Task Manager

Actual result: The project fails to open and memory usage increases continuously
Expected result: The project opens without excessive memory usage or stops attempting to open with a corresponding error message

Reproducible with: 6000.0.0f1, 6000.0.77f1, 6000.3.18f1, 6000.4.11f1, 6000.5.0f1, 6000.6.0a7

Reproducible on: Windows 11, macOS 26.5 (M4 Max)
Not reproducible on: No other environments tested

Notes:

• Editor’s progress indicator stops on importing different assets each time
• The generated Editor log ends up being several gigabytes in size
• Editor reaches >50GB memory usage when attempting to open the project