How to reproduce:
1. Open the “OnnxProject.zip“ project
2. Observe the behavior

Expected result: The Editor opens
Actual result: The Editor gets stuck on the launch screen

Reproducible in: 6000.0.36f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8
Not reproducible in: 2021.3.50f1, 2022.3.61f1, 6000.0.35f1

Reproduced on: Windows 11 Pro (24H2), Windows 10
Not reproduced on: No other environment tested

Notes:
- The importer gets stuck on this line: {{“Start importing Packages/com.unity.ml-agents/Tests/Editor/TestModels/discrete_rank2_vector_v2_0.onnx using Guid(b6c7faadd10084c3995ad9fff7aa8c54) (ScriptedImporter)"}}
- Seems to be reproducible only with this project
- Opening the project a second time usually yields the expected results. To reproduce, delete the project and re-extract it.
- In pre-regression versions, the project opens with many ML Agent package-related issues, so they could have an impact on the reproduction reliability