Не работает aspect-ratio с flex-direction: column;

.a {
 display: flex;
 flex-direction: column;
}
.b {
  background-color: red;
  width: 100%;
  aspect-ratio: 5 / 1;
}

img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

<div class="a">
  <div class="b">
    <img src="https://phonoteka.org/uploads/posts/2022-06/1655370600_27-phonoteka-org-p-kachestvennie-oboi-na-rabochii-stol-28.jpg" />
  </div>
</div>