Steps to replicate the issue (include links if applicable):
When I use the sample from:
https://www.mediawiki.org/wiki/Manual:Footer
to add an element in the footer, then the link text will be enclosed by the two characters from the subject.

What happens?:
The link text will be:
⧼Foo⧽

What should have happened instead?:
That the link text will be:
Foo

Software version (skip for WMF-hosted wikis like Wikipedia):
1.39.4

Other information (browser name/version, screenshots, etc.):
Sample source code:

$wgHooks['SkinAddFooterLinks'][] = function ( Skin $skin, string $key, array &$footerlinks ) {
        if ( $key === 'places' ) {
                $footerlinks['foo'] = Html::element( 'a',
                        [
                                'href'   => 'https://foo,bar',
                                'rel'    => 'noreferrer',
                                'target' => '_blank',
                        ],
                        $skin->msg('Foo')->text()
                );
        };
};

I have take a look in the source code of the page and the both char's will be also here.
So it can't be an browser problem.