Initial Value Template Warning - "Template 'article-by-product' not defined, using empty initial value"

S.documentTypeList('product')
            .title('Product')
            .child(productId =>
              S.list()
                .title('Content')
                .items([
                  S.listItem({
                    id: 'articles-by-product',
                    title: 'All articles',
                    child: () => 
                      S.documentTypeList('docArticle')
                        .title('All articles')
                        .filter('_type == "docArticle" && references($productId)')
                        .params({ productId })
                        .initialValueTemplates([
                          S.initialValueTemplateItem('article-by-product', { productId })
                        ])
                  }),

import T from '@sanity/base/initial-value-template-builder';

export default [
    ...T.defaults(),
    
    T.template({
        id: 'article-by-product',
        title: 'Documentation Article',
        description: 'Article for a specific product',
        schemaType: 'docArticle',
        parameters: [{name: 'productId', type: 'string'}],
        value: params => ({
          product: {_type: 'reference', _ref: params.productId}
        })
      })
  ]

"parts": [
    {
      "name": "part:@sanity/base/schema",
      "path": "./schemas/schema"
    },
    {
      "name": "part:@sanity/desk-tool/structure",
      "path": "./deskStructure.js"
    },
    {
      "name": "part:@sanity/base/initial-value-templates",
      "path": "./initialValueTemplates.js"
    }
  ]