LWRP : PixelatedUV node throws error

(up to date UT 2018.3.0f2,LWRP 4.6.0,ASE 161_003)
When trying to use 'Pixelated UV' node i get this error :
Also the shader i work is of Lightweight PBR shader type (used for sprite FWIW).
I'm far from a shader expert ^^ could use some help.
EDIT : * That's only when used in a graph linked to vertex offset ! *
When trying to use 'Pixelated UV' node i get this error :
- Code: Select all
Shader error in 'SpriteTest6_LWRP': undeclared identifier 'pixelateduv600' at line 120 (on d3d11)
Compiling Vertex program
Platform defines: UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF1 SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_LIGHTMAP_FULL_HDR
Also the shader i work is of Lightweight PBR shader type (used for sprite FWIW).
I'm far from a shader expert ^^ could use some help.
EDIT : * That's only when used in a graph linked to vertex offset ! *