Bug Issue with VFX graph and Shadergraph

I recently started exploring using custom shadergraphs in my VFX graphs, and I get an issue with not being able to see anything of the visual effect if i connect it to the custom shadergraph.

The shadergraph is pretty standard, just adding a custom light solution, as well as inserting alpha and color.
The weirdest thing is that this worked last night, but stopped working this morning, where i also get a consistent error message whenever i try to to any changes in the VFX graph:

"Shader warning in 'Hidden/VFX/LevelDust/System/Output Particle Quad': Ignoring duplicate keyword line '#pragma multi_compile_fog __ FOG_LINEAR FOG_EXP FOG_EXP2'"

See attached screenshots for full setup of the graphs.
Anyone have any idea on how to troubleshoot this further?

 

Nobody that has an idea on how to approach this?

Some other quirks to this behaviour discovered now, which makes me belive this is a straight down bug.

I recreated the shader and the visual effect from scratch, and everything works perfectly - then i try to add ONE more boolean value to the blackboard in shadergraph, save, and boom, my particles are now invisible. If i delete that property again, save, then everything is back to normal.

Just because this behaviour is so arbitrary and weird, lets keep going - so i added a float property, save - still works, then added a Vector2 property, saved - still works. Then added a bool property, saved. And. It. Still. Works.

Then tried to remove the newly added vector2 and the float. Saved. Invisible particles again. Added them again. Saved. Visible particles.