Which @angular/* package(s) are the source of the bug?

core

Is this a regression?

Yes

Description

https://stackblitz.com/edit/stackblitz-starters-hvntvw?description=An%20angular-cli%20project%20based%20on%20@angular/animations,%20@angular/common,%20@angular/compiler,%20@angular/core,%20@angular/forms,%20@angular/platform-browser,%20@angular/platform-browser-dynamic,%20@angular/router,%20core-js,%20rxjs,%20tslib%20and%20zone.js&file=src%2Fmain.ts&title=Angular%20Starter

computed doesn't work

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-hvntvw?description=An%20angular-cli%20project%20based%20on%20@angular/animations,%20@angular/common,%20@angular/compiler,%20@angular/core,%20@angular/forms,%20@angular/platform-browser,%20@angular/platform-browser-dynamic,%20@angular/router,%20core-js,%20rxjs,%20tslib%20and%20zone.js&file=src%2Fmain.ts&title=Angular%20Starter

Please provide the exception or error you saw

the value is not updated

Please provide the environment you discovered this bug in (run ng version)

No response

Anything else?

it works here : https://stackblitz.com/edit/angular-vv4wpn?file=src%2Fmain.ts,src%2Ftest.service.ts,src%2Findex.html