Yes, that sounds like some bug.. maybe the save file that's bugged out/not read correctly? Did you try restart on a new game?
I started a new game with 1.0 and had no problems getting past that part plus 1-2 hours with some new quests. Got stuck on a latter part where I only have a riddle to try get a second part of a message but haven't been able to figure that out.
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Okay guess I am still lost looking for this thing. I assumed you meant in the cooridor outside my room on the floor. I went up and down the whole cooridor and the only thing to interact with is the two slaves. Is it in a specific room or is it in the cooridor? I know I am going to feel really stupid when I do find this thing but evidently it is avoiding me, lol.
K yeah it's not there for me. I can see a green box which appears to be an ammo box on the right side but nothing else all the way down that cooridor. On the other side is the one slave on the wall and three other boxes but nothing that I can interact with or appears to be a mirror. Not sure what to do at this point other than wipe all my save data so there's nothing in it and start fresh. I am using the third character, the red head with the open spanking skirt. I wonder if each model may have bugs while others don't . Which character did you use for your run-though?