Ionic 4 beta - basic templates won't work?

Ionic Framework
1 
Ionic:

   ionic (Ionic CLI)          : 4.1.0 (D:\work\cordova\projects\ionic4\node_modules\ionic)
   Ionic Framework            : @ionic/angular 4.0.0-beta.2
   @angular-devkit/core       : 0.7.3
   @angular-devkit/schematics : 0.7.3
   @angular/cli               : 6.1.3
   @ionic/ng-toolkit          : 1.0.6
   @ionic/schematics-angular  : 1.0.5

Cordova:

   cordova (Cordova CLI) : 7.1.0
   Cordova Platforms     : android 6.3.0
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.2, cordova-plugin-ionic-webview 2.0.3, (and 3 other plugins)

System:

   Android SDK Tools : 26.1.1
   NodeJS            : v8.11.3 (D:\Program Files\nodejs\node.exe)
   npm               : 5.6.0
   OS                : Windows 10

Environment:

   ANDROID_HOME : d:\androidsdk

I can’t help but feel I’m doing something really obviously wrong here, but if I create an ionic 4 starter app (–type=angular) and select tab or side menu template, then add the android platform and run it in an emulator you get a white screen and the chrome debug console returns…

index.html:9 The key "viewport-fit" is not recognized and ignored.
file:///runtime.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///polyfills.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///cordova.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///styles.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///vendor.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///main.js Failed to load resource: net::ERR_FILE_NOT_FOUND
file:///assets/icon/favicon.png Failed to load resource: net::ERR_FILE_NOT_FOUND

Also, running ionic cordova plugin ls gives an error…

> cordova plugin ls
cordova-plugin-device 2.0.2 "Device"
cordova-plugin-ionic-keyboard 2.1.2 "cordova-plugin-ionic-keyboard"
cordova-plugin-ionic-webview 2.0.3 "cordova-plugin-ionic-webview"
cordova-plugin-splashscreen 5.0.2 "Splashscreen"
cordova-plugin-whitelist 1.3.3 "Whitelist"
net.js:704
    throw new TypeError(
    ^

TypeError: Invalid data, chunk must be a string or buffer, not object
    at WriteStream.Socket.write (net.js:704:11)
    at process.<anonymous> (D:\work\cordova\projects\ionic4\node_modules\ionic\bin\ionic:9:63)
    at emitTwo (events.js:126:13)
    at process.emit (events.js:214:7)
    at emitPendingUnhandledRejections (internal/process/promises.js:108:22)
    at process._tickCallback (internal/process/next_tick.js:189:7)

Has anyone hit this? Is this better placed as a bug report?

2

Filed a bug report