Steps to repro:
1. Download the attached project and open it.

Actual result:
Editor crashes. Last calls from the stack trace:

0x00007FF784D6CB8C (Unity) ProgressiveRuntimeManager::GetLightmappingGpuDevices
0x00007FF784BE0FF8 (Unity) Lightmapping_CUSTOM_GetLightmappingGpuDevices
0x0000013562B4EB81 (Mono JIT Code) (wrapper managed-to-native) UnityEditor.Lightmapping:GetLightmappingGpuDevices ()
0x0000013562B4DA43 (Mono JIT Code) UnityEditor.LightingWindowLightingTab:WorkflowSettingsGUI ()
0x0000013562AFF3D3 (Mono JIT Code) UnityEditor.LightingWindowLightingTab:OnGUI ()
0x0000013562AF965B (Mono JIT Code) UnityEditor.LightingWindow:OnGUI ()

Regression introduced in 2020.1.0a19,

Expected result:
Project is opened without Editor crash.

Notes:
- Reproducible in 2020.1.0a19;
- Not reproducible in 2019.3.0f4;
- Reproducible on Windows.