I swear that this used to work:
The lace curtains are a part of the cabinet.
The lace curtains can be open or closed.
The lace curtains are open.
The lace curtains are openable.
Now I just get the error message telling me that the lace curtains can’t have this property, and directing me to chapter 3.7.
Has something changed? What is the right way to make something openable now - creating a whole new kind for just one object in the game feels like overkill.