five hours in, I killed a security guard and his body (which carried a key needed to advance the mission) fell through the floor. I had to load a previous save and be extra careful about where the body landed. honestly this kind of thing isn't so bad. it's obviously a bug and I know how to fix it.
the worst are the cases where I can't tell if it's a bug, a stupid dev choice "working as designed", or simply me being an idiot. I just finished playing the clouds mission, which is a club with a main area, a VIP area, and offices behind the VIP area. once I got in, I just started wandering around. I saw a guard telling some other NPC that he wasn't allowed in the VIP area, but I tried going in anyway, since he didn't say anything to me. no warning, all the guards open fire on me and I have to reload the checkpoint. okay, guess I'm not allowed in the VIP area. I talk to someone in the main area who sends me to sneak into the VIP area to talk to someone else. this time, the guards don't react, although nothing in the dialogue indicated I had permission to be there. maybe the areas just get unlocked when you have a reason to be there? anyway, I talk to my next contact who sends me to talk to the manager in the back office. since it's now fine for me to be in the VIP area, I assume it's fine to also go in the back office area. the next guard I run into shoots me. what the fuck?