Prerequisites

This is not a usage question (Those should be directed to the community supported forum, unless this is a question about Polylang Pro in which case you should use the helpdesk).
I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
The issue still exists against the latest master branch of Polylang and the latest WordPress version.
This bug happens with only Polylang plugin active
This bug happens with a default WordPress theme active
I can reproduce this bug consistently

Steps to reproduce the issue

When I follow those steps, I see...

I was expecting...