Placeholder selector renders without @extend when using @key-frames

[fiinix]

Is this correct behavior?

I expect this to not render anything, unless @extend is used. But it is rendered.

%animated-test {
    @at-root {
      @keyframes test {
        0%, 100% {
         transform: translate3d(0, 0, 0);
       }
       50% {
         transform: translate3d(-10px, 0, 0);
       }
     }
   }
   animation-name: test;
 }

[nex3]

That's expected. @at-root is equivalent to writing the contents outside of any selector rules.