Highlight Plus Effect - bleeds through ONLY NovaUI (but not other meshes)

[najak3d]

I just bought and started using "Highlight Plus", found here:

https://assetstore.unity.com/packages/vfx/shaders/highlight-plus-all-in-one-outline-selection-effects-134149#publisher

It's a very high quality/professional asset (maybe the best highlighter on the store) -- just like NovaUI.

I'd like to get these two packages working together, and the fix is probably (hopefully) easy.

I toyed with the Billboard's (parent object's) "SortGroup" sorting Order/RenderQueue and "Render Over Opaque Geom" -- NOTHING seemed to have any impact..

I need for NovaUI world-space billboards to occlude these effects the same as other mesh objects.

In this screenshot, I drew two red circles:

1. Left - shows Yellow Outline effect correctly NOT showing through the Town buildings.
2. Right - shows this same Outline effect showing 100% through the NovaUI billboard.

And just to be sure this wasn't some issue with "backface" (e.g. maybe somehow, my billboard facing was reversed) - I inverted the Billboard facing to look AWAY from camera, to see if this magically fixed this defect. It did NOT, shown here:

(here, we can see again that buildings block the outline, but the NovaUI billboard itself does not)

[najak3d]

To further experiment - I attached to my NovaUI Billboard prefab, a separate "opaque Plane" placed 0.1 units directly behind the NovaUI billboard -- and THIS HACK WORKED.

So whatever this Plane is doing, would be very nice if NovaUI UIBlock2D could achieve the same occlusion of this HighlightEffect.

My prefab now looks like this:

And with this kludge, things look better. But we'd like to get rid of this kludge.