Question shader graph shaders - difference between editor and android

Hi,
Could someone please help me with the following shader graph issue?
Unity 2019.3.0b6, latest shader graph and URP packages.
Tested on xiaomi redmi note 4
Is there any workaround for this? I just want the backfaces to show as pure black, and the front faces to show like the simple lit shaders. Details are in the attached picture.

 

If it works in the editor, but does not work on the device, then I would consider this a bug. Even if for whatever reason this would be the expected behavior, a warning message that it won't work on a certain platform should be emitted.

If it works in the editor, but the same graph does not work on the device, please submit a bug-report as described in this document:
https://unity3d.com/unity/qa/bug-reporting

It's important that you report these issues together with a reproduction project if you want them to get fixed. If you don't do it, it might be a long time until someone else reports them or until Unity Technologies find them.

After you submitted the bug-report, you receive a confirmation email with a bug-report Case number. Please post the Case number (number only, not the link) in this forum thread for Unity staff to pick up.