-webkit-background-clip lost on CSS minify

I have this CSS in one of my stylesheets:

`
.gradient-text {
color: red;
background: linear-gradient(to right, red, blue);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
}
`

When I have “Minify CSS” enabled with “Merge CSS Files” turned on “Minify CSS Method” set as RESS, the -webkit-background-clip doesn’t get followed anymore.

Using the method “CSS Tidy” fixes this.

Not sure what the reason was, but it might be good to look into it.