Hey there. Thank you for reporting this. I’ve moved your thread to the Technical Help section, because this doesn’t seem to be a bug but rather depending on your setup 
After the v0.8.0 update, which came with a huge UE5 upgrade, rendering is using different paths and processes now. Unfortunately, this made the gap between high-end and mid-range GPUs quite visible. It’s also very likely the reason why your character isn’t visible in the mirrors anymore.
Switching to ultra reflections does little to no change here, because the game makes use of VRAM and GPU in general differently now. I’m not a tech specialist, but I’ve done quite a bit of research on inZOI’s technical requirements over the past months of “working” here in the forum, so I assume your GPU isn’t capable of producing those character reflections in the mirrors anymore.
You can still try to take a look at this guide I have just revised after the recent changes: inZOI – Graphics & Performance Guide (revised after update v0.8.2)