To Reproduce:

1. Open the project from the attached 'buttonReproProj.zip' and run.

2. Click on 'Throw Exception' and 'Invoke Button' buttons.

3. Notice if 'OnButton' is called by actually clicking the button the thrown 'InvalidOperationException' is not identified correctly(?) by Unity. All data related to the actual exception, it's type, the stack trace are not shown, neither in the Console nor the in the Editor.log.

4. Calling the event through onClick.Invoke (); does not obscure the aforementioned information.

5. Uncomment the try/catch block, notice that if the exception is caught it's name and stack-trace are not hidden.

Regression in b15