CSS method mask has wrong behavior after Drupal style compression

Hi folks, I found problem with CSS compression.

What are the steps required to reproduce the bug?

Create style with

.element {
   mask: url(#video-mask);
}

This code is valid according to CSS mask

Then enable CSS compression on performance page.

What behavior were you expecting?

See the same result in compressed file:

.element {
   mask: url(#video-mask);
}

What happened instead?

.element {
   mask: url(/themes/custom/THEMENAME/styles/css/#video-mask);
}