S-button do not show icons when in page action slots

Polaris
8

@Anthony_Frehner and @Mateus_Ferreira It appears that with some updates to the web components, buttons with an icon set do not render at all in the page header (when viewed embedded in the admin). E.g. now this code does not show any buttons at all.

export default function Demo() {
  return (
    <s-page heading="No icons?">
      <s-button href="" slot="primary-action" variant="primary" icon="plus">
        {"<--No icon"}
      </s-button>
      <s-button href="" slot="secondary-actions" icon="plus">
        {"<--No icon"}
      </s-button>
    </s-page>
  );
}

Without the icon=plus bit, the buttons show fine.