[v5] Can't add a utility class with map-merge

[adro21]

Following the docs here in v5 trying to add a cursor utility. I have _utilities.scss loaded first and then I have this (as per the docs):

@import "bootstrap/scss/utilities";

$utilities: map-merge(
  $utilities,
  (
    "cursor": (
      property: cursor,
      class: cursor
      responsive: true,
      values: auto pointer grab,
    )
  )
);

I'm then adding this class to my element:

<a href="#" class="cursor-grab">Grab this</a>

However, the cursor-grab class is nowhere to be found in the CSS output. Any idea what I'm doing wrong?