TypeError: sink._addParentTeardownLogic is not a function upgrading cli 6.1.5 -> 6.2.1

[smiera]

Bug Report or Feature Request (mark with an x)

- [x ] bug report
- [ ] feature request

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

Angular CLI: 6.2.1
Node: 10.1.0
OS: darwin x64
Angular: 6.1.7
... common, compiler, compiler-cli, core, forms, http
... platform-browser, platform-browser-dynamic, router
... service-worker

Package Version

@angular-devkit/architect 0.6.8
@angular-devkit/build-angular 0.6.8
@angular-devkit/build-ng-packagr 0.7.5
@angular-devkit/build-optimizer 0.6.8
@angular-devkit/core 0.7.5
@angular-devkit/schematics 0.7.5
@angular/cli 6.2.1
@angular/pwa 0.7.5
@ngtools/json-schema 1.1.0
@ngtools/webpack 6.0.8
@schematics/angular 0.7.5
@schematics/update 0.8.1
ng-packagr 3.0.6
rxjs 6.3.2
typescript 2.9.2
webpack 4.8.3

Repro steps

ng b --prod xcore

The log given by the failure

Building Angular Package
sink._addParentTeardownLogic is not a function
TypeError: sink._addParentTeardownLogic is not a function
at Observable.subscribe (./node_modules/rxjs/internal/Observable.js:27:18)
at ./node_modules/@angular/cli/node_modules/rxjs/internal/util/subscribeToObservable.js:10:20
at Object.subscribeToResult (./node_modules/@angular/cli/node_modules/rxjs/internal/util/subscribeToResult.js:7:45)
at MergeMapSubscriber._innerSub (./node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:75:38)
at MergeMapSubscriber._tryNext (./node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:72:14)
at MergeMapSubscriber._next (./node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:55:18)
at MergeMapSubscriber.Subscriber.next (./node_modules/@angular/cli/node_modules/rxjs/internal/Subscriber.js:64:18)
at MapSubscriber._next (./node_modules/@angular/cli/node_modules/rxjs/internal/operators/map.js:52:26)
at MapSubscriber.Subscriber.next (./node_modules/@angular/cli/node_modules/rxjs/internal/Subscriber.js:64:18)
at TapSubscriber._next (./node_modules/@angular/cli/node_modules/rxjs/internal/operators/tap.js:62:26)
npm ERR! code ELIFECYCLE

Mention any other details that might be useful

Build success with rxjs version: 6.2.2

[alan-agius4]

Relates to #12262

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