Found the missing link to turn off the pre-fetching, turned out it was a vue plugin causing it outside of pwa etc

https://medium.com/@mrodal/how-to-make-lazy-loading-actually-work-in-vue-cli-3-7f3f88cfb102

ayanova/vue.config.js

@@ -1,5 +1,9 @@
 const MonacoWebpackPlugin = require("monaco-editor-webpack-plugin");
 module.exports = {
+  //https://medium.com/@mrodal/how-to-make-lazy-loading-actually-work-in-vue-cli-3-7f3f88cfb102
+  chainWebpack: config => {
+    config.plugins.delete("prefetch");
+  },
   configureWebpack: {
     plugins: [
       new MonacoWebpackPlugin({