ImmediateModeShapeDrawer not drawing duplicated shapes

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Hi,

I'm trying to wrap shapes into a ShapesManager, child of ImmediateModeShapesDrawer.
I noticed that drawing twice the same type of shape in the command makes that shape not drawing at all.

Here's the code I used to debug my manager : 

Here's the result in play mode (spheres not drawing): 

And here's the result when I remove line 52 (working as expected for L50-51): 


To explain a bit the Manager outside of my debug : 
The manager receive gizmos from the code 
the "gizmos" used are Actions calling Draw's methods

So I have one Command drawing all the needed shapes
(not sorted yet for batching)

Reporting a bug? please specify Unity version:
2021.2.0f1
Reporting a bug? please specify Shapes version:
4.1.1
Reporting a bug? please specify Render Pipeline:
Built-in render pipeline
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robin roekens

Tried with URP, the issues isn't there but I wonder why it happened in Build-in 

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Freya Holmér

whenever it doesn't draw when putting two draw calls in a row, it means GPU instancing is broken, somehow.

I would try a clean reinstall, quite often shader issues like this are caused by updating in place or just, weird Unity magic

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robin roekens
Quote from Freya Holmér

whenever it doesn't draw when putting two draw calls in a row, it means GPU instancing is broken, somehow.

I would try a clean reinstall, quite often shader issues like this are caused by updating in place or just, weird Unity magic

Ok thank you for your answer.