Rendertargets showing material balls

Version: 4.26.1

Hi !
The “Render Target Create Static Texture Only” node in Blueprints is giving me strange results we haven’t seen before. Even after a clear of the Rendertarget with the “Clear Render Target 2D” node, items I am rendering to texture with a scripted action are having their material mapped onto a “material/reflection ball” in the top left corner of the texture. I use the scenecapture2D component with the primitive rendermode set to “use ShowOnly List” and this list only includes the 3D object I’m capturing.

Is this a new feature or am I missing some toggle in the scenecapture2d component to turn this off? I don’t want these spheres rendering in the corner but I cannot find any way to remove them.