Why does the $_GET parameter ?search forward the front-page to the archive/blog page

I need the $_GET parameter ?search for my front-page for a third party plugin.
Whenever I enter http://wp-site.tld/?search=foo I get redirected to the blog/archive page.
If I enter http://wp-site.tld/some-page/?search I get redirected to /some-page.
It appears to be a redirection only for the front-page.