In SlicerMorph there was specific installing of certain Open3D dependency packages first to avoid the install of Open3D getting a later version of notebook. This was done because on some platforms like macOS the dependency couldn’t build the package from source.
re: Open3d pip_install error on Mac - #4 by jamesobutler
I remember Open3D having a laundry list of dependencies. Maybe something has changed in the similar manner where it is having to build a wheel that struggles with greek locale, or a dependent package was updated and resulted in changes.