I tested with another roles data (21 roles) you provided. I can not reproduce the issue with import exported role. I tried create a role as a copy of another one and export/import it. No problem.

Technically new role from scratch and role as copy of another role are created the same way both. New role created just as a copy of subscriber role.

Definitely, a reason of the issue is somewhere else. Is it possible to get access to your site stage copy with admin access to reproduce/investigate the issue?