Repro:
1. Download the attached repro project ('UpgradeCrash17042InitialStableRepro');
2. Open the project in version 2019.1.0f2;
3. Let the lighting auto-bake;
4. As soon as the light baking finishes, save the project and close Editor;
5. Open the project in 2019.2.0a11 or later;

Expected Result:
The editor generates the lighting as needed without crashing.

Actual Result:
The editor crashes during the light baking process. See attached video and Editor.log.
Regression introduced in version 2019.2.0a11.

Following calls are shown in the stacktrace:

BakeJobConservativeRaster::Execute
JobManager::UpdateFunction
JobQueue::Exec
JobQueue::Steal
JobQueue::ExecuteJobFromQueue
JobQueue::ProcessJobs
JobQueue::WorkLoop
Thread::RunThreadWrapper

Notes:
- Occurs on Windows and OSX.
- Occurs on 2019.3.0a1, 2019.2.0a12, 2019.2.0a11
- Does not occur on 2019.1.0f2, 2019.2.0a10
- The issue happens when either baking manually or using auto-bake.

Alternative repro (doesn't happen steadily):
1. Open Unity
2. Open the attached project
3. Open SampleScene.scene if not open already
4. Select the Cube GameObject in the hierarchy
5. In the inspector, select the dropdown next to the Static checkbox and select "Contribute GI"