Got the newest version (0.4.2), and it seems like picking up Marley's key doesn't give you the key, so I'm soft locked currently. Tried picking it up across 3 saves with the same results.
If you are trying to reuse old saves from 4.0, it will not fix.
I haven't used any old saves, 4.2 is my first time playing through.
Marley's Key isn't used in a straightforward manner.
It doesn't unlock the door from the hallway.
You can enter Marley's room without the key.
that key doesn't unlock her door. It unlocks her closet.