Hello, did you intentionally disable light probe bounding box in the
Light probes tab or was the lightprobe automatically added without this setting?
For such rectangular room the lightprobe should have the bounding box enabled and aligned with the room walls, floor and ceiling. After such change the reflections in the water are well aligned with real world location of the objects and the person is visible in the water.
The person won’t be correctly reflected in the mirror. The light probes based reflections are an approximation, all reflections images are generated using 6 images that are captured in the light probe location (center of the room). This 6 images don’t have enough information to correctly reflect a person that stays close to the mirror. The front of the person that should be visible in the mirror isn’t even visible from the light probe location. If you moved the guy to stay in one of the corners, he should be more correctly reflected, although the reflected geometry will be distorted.