Well, the Mirrors are suppose to be 'techy'. Plus, I'm pretty sure they can't have reflective surfaces automatically reflect. Because you're a headless demon-spawn.
If you've played Resident Evil 3 remake, then you've noticed that the first 2-5 minutes are played in first person. During that time Jill (protagonist of RE3) goes to the bathroom at her appartment to look in a mirror. Now the 1st person model of Jill is probably also headless (or even without a torso, I don't now for sure), so if the developers just would have used a reflecting plane, to serve as a mirror, then you would indeed see a headless 1st person Jill.
During my creation of the Jill In Black mod at nexusmods, I've noticed they've used a complete mirrored 3rd person model of Jill to stand in while she's looking at the mirror, and that the mirror itself is actually a window to a hidden area that mimics the surroundings of said mirror. To get away with that they probably have to "mirror" everything within visible range of said mirror into that hidden area.
Now why go through all that trouble just to make it possible for a headless model to take a look in a mirror, instead of just using a complete model? The only explicable reason I can think of is to prevent possible risk of clipping from the head with the ingame camera when using a complete model.
It's possible that they've used a similar approach in Cyberpunk 2077 and that they've restricted the viewing to the mirror into a strict action, just to limit the surroundings that have to be "mirrored" into a hidden area behind said mirror.
But to use some sort of futuristic mirror that shuts down behind a magnetic field to back it up, is unconvincing to me. What added value has such an expensive sci-fi mirror opposed to an ordinary mirror, like we are used to? There are icons present at the sci-fi mirrors, like an envelope for example (for checking your mail?), that indicates those mirrors can also be used as a (touch)screen. But again, what added value has it towards people who have augmented reality into their eye implants for such tasks?
Also several 1st person games, older than 10 years (Doom 3 (2004), Comdemned 2: Bloodshot (2009),...), doesn't seem to have any issues with the presence just plain classic mirrors. Okaaaayy, those aren't huge openworld games, but still....
AAALLLSO, I repeatedly lose my hat, hair, and glasses when looking in mirrors. The only thing I see is my bald(ed) character.
Continuing on my explanation above, this may be due to glitches into the communication between the parameters of your player and the mirrored stand-in model.
In the end I don't know that for sure. I now some things, but I'm no expert.