Then I suspect they also exist in even earlier versions, and are actually tied to your development setup.  That should still be fixed, but it is probably not in Python's own code.  It might be in python's build process, which is still on us.  Or it might be in your distribution, or in a dependency like Tk, or in your personal C compiler or setup.

Could you look to see what your system's actual passwd file says, and how tcl rounds outside of python, and how many color pairs your curses supports or has?