Question Colour artifacts when using Shader Graph on quads

Hello everyone. I would like to seek help and advice on this shader problem I'm facing.

I made this tree using the built-in unity tree creator for the wooden part. Then I used quads to make the leaves and created a leafy shader using Shader Graph. The leaves looked the way I wanted, but when it is put into a lighted environment, it revealed these strange artifacts. I used the Sprite Lit Shader Graph to create the shader.


This is tree in an unlit environment, the way I wanted it to look.


This is the Shader Graph for the leaves.


Attempts made:
- Using planes instead of quads: Similar result
- Using Sprite Unlit Shader instead of Lit: Similar result

Version: Unity 2019.2.18f1
Render Pipeline: LWRP

Any help is very much appreciated. Thank you for your time.