I am facing the same issue as well. Iustihro will freeze in place at the top of the ladder after the 2nd encounter with the Library Chimera - Egg scene.
Also
Another bug I came across happened after the 2nd encounter with Greenhouse Chimera - when you switch with Zasaraja and talk to each Chimera. To make this easier to understand, I will give the Chimeras a number:
Library, east door (tentacle & gel chimera) = 1
Patricia, west door (Girl chimera) = 2
Greenhouse, south door (Spiderweb chimera) = 3
If you talk to them in this order: 1-2 or 2-1, after the second conversation, the game would black screen.
What worked for me was to go in this order, 3-1-2. I had to re-load 3 times to figure this out. Even after getting past this point, the Main Character sprites bugged out a little (invisible, switching between Iustihro and Zaraja) until you are teleported away to the Clocktower.