Thanks for the clarification, and thanks to Aurelien for pointing me in the right direction. I wasn't aware that it was updated since there wasn't any indication, sorry about that.
I'm not sure if the bug is replicable. I was wondering around collecting notes while in Lina's timeline, and the place where Zoltan's note should have been was empty. When I completed that timeline, I went back to check (since it was rather odd that there was an entire room with nothing in it), but there was still nothing there until the next playthrough.
The game was still very fun despite some hiccups. Well done again! :D