Instance Tool - Editing instances directly in editor viewport

thanks… don’t think this is the issue. I am using static lights throughout, and my materials are set to use Instanced static meshes… so would expect this to work out of the box. I found another thread by the author showing how static lighting renders correctly… but I can’t seem to get that result.

So tried a brand new 4.20 project with nothing but a few cubes and a material. same problem! This should be very easy to replicate and confirm as a bug?