<s-page> within a App Window does not support button group

Hello,

If the is used in the context of an App Window, the secondary-actions won’t work if it uses the :

<s-page heading="foo">
  <s-button-group slot="secondary-actions">
    <s-button slot="secondary-actions" variant="secondary">Foo</s-button>
    <s-button slot="secondary-actions" variant="secondary">Bar</s-button>
  </s-button-group>
</s-page>

When used outside the context of an , this works as documented.