Aedvald Tseh's answer did help me so thanks for that. However, I found that the following finer-grained configuration also corrects this error but allows for some of the production optimization:

              "optimization": {
              "scripts": true,
              "styles": {
                "minify": true,
                "inlineCritical": false
              },
              "fonts": true
            },

For info see the Angular documentation: Angular doc on optimization