Internal wiki links containing non-ascii characters forcefully opening in new tab

Summary

Wiki links of the form [[name]] with ascii-only characters have no special treatment and are opened in the same browser tab. Links containing Polish characters (for example [[aśd]]) open in new tab.

Steps to reproduce

Add the following content to a wiki page:

[[asd]]

[[aśd]]

Example Project

https://gitlab.com/jstasiak/wiki-issue-demo/wikis/home demonstrates the issue.

What is the current bug behavior?

Some links open in new tabs.

What is the expected correct behavior?

All wiki links behave the same (open in the same tab by default).

Relevant logs and/or screenshots

This is the HTML code generated from the Markdown source:

<a href="/jstasiak/wiki-issue-demo/wikis/asd" class="gfm">asd</a>
(...)
<a href="/jstasiak/wiki-issue-demo/wikis/a%C5%9Bd" class="gfm" rel="nofollow noreferrer noopener" target="_blank">aśd</a>

It clearly shows that there's a different treatment going on.

Output of checks

This bug happens on GitLab.com

Possible fixes

Some parsing/validation issue I expect.