Angular CLI 6: background-image issue

Question

Angular CLI 6.0.3 resolves sass code background-image: url(assert/folder1/x.png); as background-image: url(x.png); in css.

I have a lot of such places

...
background-image: url(assert/folder1/x.png);
...
background-image: url(assert/folder2/x.png);
...
background-image: url(assert/folder3/x.png);
...

But all these definitions become to be like

...
background-image: url(x.png);
...
background-image: url(x.png);
...
background-image: url(x.png);
...

It means that all classes have the same image...

How can I force Angular CLI to leave a path of an image?

UPD: the issue effects only for dev mode

Answer 1

The solution was to add "outputHashing" property with "media" value.

/* angular.json */
{
  ...
  "projects": {
     ...
     "your-project": {
        ...
        "architect": {
           ...
           "build": {
             ...
             "options": {
                ...
                "outputHashing": "media",
                ...
             }
           }
        }
     }
  }
}