Prepend brakes SVG icon references

I use inline SVG icons like this in my `components/side-bar.hbs`:

```

```

Here is what I get after `prepend`:

```

```

Here is what I expect to have:

```

```

Basically, `prepend` removes the `#` from the icon reference `icons-2d8bb19bb3d1a09b68444738ca864c06.svg#my-icon-name`, after that the reference will look like this: `icons-2d8bb19bb3d1a09b68444738ca864c06.svgmy-icon-name`.

I have this problem only when I use `prepend`. Why `prepend` removes the `#` from the original URL?Please advise how we can solve this problem. It actually can be related to this one https://github.com/rickharrison/broccoli-asset-rev/issues/42

Just in case, here is how the `icons.svg` looks inside:

```

```