Ionic 5 with Angular 9 - Angular JIT compilation failed: '@angular/compiler' not loaded

Question

Ionic 5 was announced a few hours ago (12th Feb 2020) and I upgraded my one of the small production app to Ionic 5 along with Angular 9:

Answer 1

Tried several ways, including npm update, with no success. The only way I could get Ionic 5 with Angular 9 to work in production mode, was setting "aot": false and "buildOptimizer": false in angular.json.