AssetBundle Includes C# Icons... BUG?

Hi,

I'm using Unity 2018.2.6f1. I notice the same behaviour in 2017.x and 5.6.x.

When I follow these "Script Select Icon button" instructions to assign a png icon to a C# file...

https://docs.unity3d.com/2018.1/Documentation/Manual/AssigningIcons.html

The meta file for the "SampleClass" C# class updates properly to include a dependency for the icon...



All good.

I have created a "SampleScriptable" instance from a C# class and that instance shows the icon in the Project Window.

All good.

I create a new AssetBundle with the "SampleScriptable". The AssetBundleBrowser shows the dependencies.



All good.

However, the "SampleIcon" is included. My use case for such icons is editor only. So I do not want my built game to include such icons and I don't want my built bundles to include such icons.

Questions

Is there a way to prevent the icon from being included in the bundle?

And/or does this seem to be a Unity bug?