transition-style/src/polygons/opposing-corners-out.css

just add water clip-path mask transitions

@keyframes polygon-out-opposing-corners {
  from {
    clip-path: var(--opposing-corners-in);
  }
  to {
    clip-path: var(--opposing-corners-out);
  }
}

[transition-style="out:polygon:opposing-corners"] {
  --transition__duration: 1.5s;
  animation-name: polygon-out-opposing-corners;
}