I am using Emacs (GNU Emacs 24.5.1, which is admittedly old, but the problem also exists on a newer (25 something) Emacs on a different machine) and sage-shell-mode to work with the computer algebra system SageMath.
Unfortunately, Unicode output is garbled.
Here is a picture of how output looks:
and here is a picture of how it should look:
I do not know what other information might be useful.
buffer-file-coding-system
is utf-8-unix