XB editor controller does not render libraries placed into the footer

Within the preview/canvas iframe, global assets are rendered via drupalSettings.xb.globalAssets, which includes jsFooter. Can you clarify steps to reproduce the bug you're seeing?

We're adding extra libraries to the editor using KernelEvents::RESPONSE => ['onRespond', 50] for $route_name === 'entity.xb_page.edit_form' || $route_name === 'experience_builder.experience_builder' and:

        $response->addAttachments([
          'library' => [
            'module/our-library',
          ],
        ]);