I'm pretty sure I found a bug. After accepting Yvon's deal, I went around the mansion for a bit before going to Ivan. I actually stumbled into the archives with Margaret before even knowing I was supposed to. After getting past her, I didn't have the garden key, so I couldn't progress and decided to get back to what I was supposed to do. I went up to Ivan's office only to find that he wasn't there, and the way to the old key was still blocked. I stumbled around for a long while until I looked at another play through and found he should have been there, meaning I was soft locked. I reloaded from a past save, (luckily I had alternated between the three) did the stuff with Yvon, and went straight to Ivan this time, and sure enough, there he sat. I'm sure me doing stuff with Margret early caused this. I know it was kinda dumb in the first place to not just go to Ivan but, I was really interested in the artist and kinda wanted to find him more. I still have the soft locked save, so if you need any pictures, or need me to try anything, I'd be happy to because this was a really awesome game, that I thoroughly enjoyed and I really wanna help as much as I can.