Corrupted `ng update` installs the beta version of @angular packages

[Ploppy3]

🐞 Bug report

Command (mark with an x)

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

Is this a regression?

Unknown

Description

ng update @angular/cli installs the beta version of @angular packages & shows incompatibility warnings.

🔬 Minimal Reproduction

🔥 Exception or Error

🌍 Your Environment

Angular CLI: 8.2.0
Node: 12.3.1
OS: win32 x64
Angular: 8.2.1
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router, service-worker

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.802.0
@angular-devkit/build-angular     0.802.0
@angular-devkit/build-optimizer   0.802.0
@angular-devkit/build-webpack     0.802.0
@angular-devkit/core              8.2.0
@angular-devkit/schematics        8.2.0
@angular/cdk                      8.1.2
@angular/cli                      8.2.0
@angular/material                 8.1.2
@angular/pwa                      0.12.4
@ngtools/webpack                  8.2.0
@schematics/angular               7.2.4
@schematics/update                0.802.0
rxjs                              6.5.2
typescript                        3.5.3
webpack                           4.38.0

Anything else relevant?

This project was previously updated to the beta branch of Angular to test ivy and it seems that since then, I always got problems updating my project.

[clydin]

Duplicate of #14980

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