Skeleton.shade different behaviour on Flutter Web Safari

[sidlatau]

I see the code below behaves differently on Chrome and Safari:

Skeletonizer(
  child: Skeleton.shade(
    child: SearchCard(
      request: ApiRequest.fake(),
      onTap: () {},
    ),
  ),
)

On Chrome (and mobile apps) it looks as expected:

But on Safari all fake data is visible, skeletonizer is not applied:

If I change Skeleton.shade to Skeleton.leaf, it works correctly in Safari. I did not anticipate any difference in behaviour between Safari and Chrome. Is this expected, or could it be a bug?