Dear Developer i might have found a bug which prevented me to progress any further.
I was accepted the the Daily task of bringing a coffee to Hanna.
* I've put the coffee into the machine
* Grabbed Sugar and Milk
* Then picked up the Coffee
However after going really close the Hanna, the ability to interact with her was no appeared.
No matter how close i reached her, it just doesn't appeared the text to Interact [E].
On the other hand i've noticed that her nameplate above her head was not visible during this time.
UPDATE:
It seems after completing the Final Exam quest, i am no longer be able to interact with Hanna nor im be able to save the game.
---
As a programmer myself, i can recommend making your systems stateless as much as possible.
This way you can avoid creating conflicting features in game when from one reason to the other unable progress.
For me it was really annoying since during that state, the game does not allow you to save your progress as the Save Game button was not present in the main menu.
Since i was not saved from a pretty long time, i've had to give up many days worth of progress.
As a safe guard you might want to introduce an auto save feature each morning when the character wakes up.