Hello there and don't mind me chiming in on this.
Everything that is only visible through a reflection (and not directly on screen) is handled with ray-tracing. For objects that are already on the screen, we have other techniques to include them in reflections. For every object that is processed with ray-tracing, we have a geometry budget that we try to fit it into; if the budget is filled, then the objects that will be seen in the reflections will not be everything that is expected. That's why its important to simplify your models in terms of vertices as much as possible.
Since you show an outdoor scene, I assume that there is a lot of geometry in the surrounding area and in the buildings. A workaround for your case would be to remove any geometry that isn't in the viewport and shouldn't be visible in the reflections. Only keep the objects that you know will be visible.
We are discussing ways of providing the option to users who have very large VRAM to increase that geometry budget. But there is no guarantee of when (or if) that will be implemented yet.