I have a problem, where my lights are not showing up in mirror reflections (“visible in reflection” is turned on, as is light source visible). I have tested this in various models, but still has the same issue. The lights show in the refelction during live real time, however once rendered or previewed they don’t show anymore.
Update: Testing lights, in a new project with just a mirror and lights, as soon as a light is moved below the horizon line its shape wont reflect anymore in the mirror (internal scenes light shape wont reflect at all). As soon as roughness is added to the mirror it will reflect the shape correctly but then the mirror is not smoooth anymore.