Editor crashes with OpenGLCore: how to debug?

I'm the developer of Bolt and I'm having some users report frequent crashes when they set their Graphics API to OpenGLCore (or more rarely Metal on OSX) in the editor (Edit > Project Settings > Player > Standalone):



So far, researching other reports of this issue is not encouraging:

• Changing Graphics API crashes Unity Editor: No reply
• Making OpenGL Core Default Graphics API crashes the editor: Won't Fix
• Switching Graphics API to any OpenGL crashes Unity: By Design (?!)

I tried it myself and got an instant crash. The problem is that I have no idea where to start looking for what might be causing this issue, or how to fix it.

• Are there log files that could indicate where the crash occurs?
• Is there any way to link the cause of the crash to the managed code?
• Are there known "unsafe" or "incompatible" methods in the Unity EditorGUI API?

I can't start disabling parts of Bolt blindly until I find what rendering instruction(s) cause(s) crashes, so I need a little help!