Warning on attribut in media query

[MatBdry]

I got a warning when I lint my code for an attribute declaration, when it's in a media query:

@media $large-2 {
    [data-region].slide-in-rtl {
        animation-duration: 0.5s;
    }

    [data-region].slide-out-ltr {
        animation-duration: 0.4s;
    }
}

But this does not trigger a warning (outside the media query):

[data-region].slide-out-ltr {
    animation-duration: 0.25s;
}

Do you have any idea ??

Thanks !