How to reproduce:
1. Make sure you're running a setup with a processor with a large amount of cores ("AMD Ryzen Threadripper 2990WX 32-Core Processor" for example)
2. Open a new project

Expected result: Project opens up without any problems
Actual result: There are several errors saying 'ManagedJobIndexPool ran out of indices.' in console

Reproducible with: 2019.2; 2020.1

Notes:
- Crashes on exit with the following stack trace:
AtomicStack::Push
ThreadJobIndex::FreeActiveJobIndex
JobQueue::WorkLoop
Thread::RunThreadWrapper
start_thread
clone

Workaround that works in versions 2019.3+:
Decrease the amount of current number of worker threads available to the Unity JobQueue by using this:
https://docs.unity3d.com/2019.3/Documentation/ScriptReference/Unity.Jobs.LowLevel.Unsafe.JobsUtility.JobWorkerCount.html
or launch Unity with this command line argument: '-job-worker-count XXX'