Drupal alter's svg fill path's with base url -> broken svg

Example inside an svg that is imported in css as data-url:
<path fill="url(#SVGID_1_)" d="M1256.4,386h1500v21h-1500V386z"/>

Notice the "url(#SVGID_1_)". This will be converted to
url(http://domain.com/path/path/#SVGID_1_1)

Resulting in a broke svg.

(added an svg that has this problem)