How to reproduce:
1. Install and ensure that “Accelerator“ is running https://docs.unity3d.com/6000.1/Documentation/Manual/accelerator-install-installer.html
2. Extract the attached “IN-110509.zip“ Project
3. Ensure that the Project’s “Library” folder is deleted
4. Open the “IN-110509.zip“ Project
5. Open up Task Manager
6. In the ‘Processes’ tab, use the search field labeled ‘Type a name, publisher, or PID to search’ and enter “unity"
7. Run the Editor using these arguments: “-batchmode -quit -EnableCacheServer -cacheServerEndpoint 127.0.0.1:10080 -cacheServerNamespacePrefix AcceleratorHang -cacheServerEnableDownload true -cacheServerEnableUpload true -cacheServerWaitForConnection 5000 -cacheServerWaitForUploadCompletion ‑ignorecompilererrors -accept-apiupdate -stackTraceLogType Full“
8. Observe the Task Manager

Expected result: The task finishes, and the Editor quits successfully (with -quit flag)
Actual result: Import does not complete, and the Editor does not quit (visible in Task Manager)

Reproducible with: 2023.3.0a7, 6000.0.55f1, 6000.1.15f1, 6000.2.0a3, 6000.3.0a4
Not reproducible with: 6000.2.0f1
Fixed in: 6000.2.0a4
Could not test with: 2023.3.0a6 (Project invalid dependencies)

Reproducible on: Windows 11, MacOS 15.5 (Silicon)
Not reproducible on: No other environment tested

Notes:
- In versions after 6000.2.0a3, the issue does not reproduce, but in 6000.3.0a1 they reappear again
- Does not reproduce 100% of the time, sometimes completes successfully
- Correcting or removing the packages in older versions causes the bug to not reproduce on newer versions