DrawMeshInstancedIndirect doesn't work on WebGL

Is DrawMeshInstancedIndirect supposed to work on WebGL? I am using WebGL 2.0, and instancing is supported, however the object doesn't show up, and I can't get DrawMeshInstancedIndirect to work at all on this platform.

I have attached a minimal project with a scene that demonstrates the issue. If you select "graphics emulation": "no emulation", or any platform other than WebGL, it works and the square appears. However, if you switch to the WebGL platform and select "Graphics emulation": "WebGL 2.0", it doesn't appear.

I would appreciate any help. Thanks!

 

I'm using just MeshInstanceRenderer and the MeshInstanceRendererSystem with Entities. I'm getting a no show in any build that involves IL2CPP eg. Windows, WebGL2.0. Mono works absolutely fine. I have tried everything, I cannot get an instanced MIR to show in anything built with IL2CPP. I heard maybe it is something to do with byte stripping, so added the below to a link.xml file (no idea if it is working)

-<linker>
-<assembly fullname="Unity">
<type fullname="Unity.Entities.Hybrid" preserve="all"/>
<type fullname="Unity.Rendering.Hybrid" preserve="all"/>
</assembly>
</linker>

I have disabled shader variant stripping. I have tried preserve. I have Instancing on in the materials. Tried different shaders. Tried adding a GameObjectEntity, MeshInstanceRendererComponent.

Do you have any advice how to get the instanced meshes to show on IL2CPP builds, or is this currently not working with ECS? Is it my code or is it because it's preview? I'm using 2018.3 (I was using 2018.2 but though that might fix it!)

 

If I build using Mono, and set the Managed Stripping Level to Low, this also makes the MIRs no show. So it is something to do with this, which is automatic with IL2CPP.