I recently discovered that light probes from an additively loaded scene were affecting 3D elements intended for UI display, despite being tens of thousands of units away from the light probes. Light probes currently have no falloff range, and no culling mask to make it so they only affect certain things (like how lights work). Currently, the only way to avoid using Light Probes on a mesh is to disable them on each mesh that doesn't want them. I also tried putting a cube of light probes around the lights in the scene, out of falloff range of the lights, so that the nearest probe to my other meshes wouldn't have any light emitting from them. However, if you have light probes enabled for a mesh (default), then ambient light doesn't affect it (which is also odd to me).