EnableNullableFieldFlattening being a developer flag, tests using this feature should not be run in product mode, otherwise the VM fails to boot with the following error message:
Error: VM option 'EnableNullableFieldFlattening' is develop and is available only in debug version of VM.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Error: VM option 'EnableNullableFieldFlattening' is develop and is available only in debug version of VM.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.