Changes will no longer be recognized if you remove and re-add same component

Start with the linked StackBlitz reproductions and run the serve command using the remove-and-re-add sequence described in the issue. Compare behavior before and after ng cache clean; done means subsequent changes to the re-added component are recognized without clearing the Angular cache or restarting the dev server.

Command

serve

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

Changes will no longer be recognized if you remove and re-add same component.

Minimal Reproduction

Removing and re-adding the import of the component (import { TestComponent } from ‘./test/test.component’), the component in the imports array and in the template (<app-test>) leads to that no further changes to this component are recognized.

Repro App V18

Problem also in V19

Exception or Error

Your Environment

**v18 Reproduction environment:**
Angular CLI: 18.2.12
Node: 18.20.3
Package Manager: npm 10.2.3
OS: linux x64

Angular: 18.2.12
... animations, build, cli, common, compiler, compiler-cli, core
... forms, platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1802.12
@angular-devkit/core         18.2.12 (cli-only)
@angular-devkit/schematics   18.2.12
@schematics/angular          18.2.12
rxjs                         7.8.1
typescript                   5.5.4
zone.js                      0.14.10

**v19 Reproduction environment:**
Angular CLI: 19.0.0
Node: 18.20.3
Package Manager: npm 10.2.3
OS: linux x64

Angular: 19.0.0
... animations, build, cli, common, compiler, compiler-cli, core
... forms, platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1900.0
@angular-devkit/core         19.0.0
@angular-devkit/schematics   19.0.0
@schematics/angular          19.0.0
rxjs                         7.8.1
typescript                   5.6.3
zone.js                      0.15.0

Anything else relevant?

After clearing the Angular cache with ng cache clean and restarting the dev server with ng serve it works again.
So probably a caching bug.