My workspace is in nx and my application is angular 18, and running node version 20.15.0 both are stable versions. I have provided my settings below.

toaster component will get the first effect event. However all following will fail. I do have to run npm i with the –legacy-peer-deps flag as well. However even running the same and swap the signals with a behavior subject and it will produce the same results.

app.component.ts

import { ToasterComponent } from '@libs/components';
import { Component, effect, inject} from '@angular/core';
import { RouterModule } from '@angular/router';
import { ToasterStore } from '@lib/stores';
import { ToasterEventType, ToasterPlacement, ToasterPosition } from '@libs/enums';
import { Toaster } from '@libs/models';
import { getState } from '@ngrx/signals';
import { CommonModule } from '@angular/common';


@Component({
  standalone: true,
  imports: [CommonModule, RouterModule, ToasterComponent],
  providers: [ ToasterStore ],
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrl: './app.component.scss',
})

export class AppComponent {

  toasterStore = inject(ToasterStore);

  constructor() {
    effect(() => {
      const appState = getState(this.toasterStore)
      console.log('app state updated', appState);
    })
  }

  updateToaster() {
    const toaster: Toaster = {
      timeout: 5000,
      toasterEventType: ToasterEventType.Success,
      toasterPlacement: ToasterPlacement.center,
      toasterPosition: ToasterPosition.Top
    }
    this.toasterStore.updateToaster(toaster)
  }

appConfig

import { ApplicationConfig, isDevMode, provideExperimentalZonelessChangeDetection } from '@angular/core';
import { provideRouter } from '@angular/router';
import { appRoutes } from './app.routes';
import { provideServiceWorker } from '@angular/service-worker';
import { provideHttpClient, withFetch, withInterceptors } from '@angular/common/http';
import { bearerInterceptor } from './interceptors';

export const appConfig: ApplicationConfig = {
  providers: [
    provideExperimentalZonelessChangeDetection(),
    provideHttpClient(withInterceptors([bearerInterceptor]), withFetch()),
    provideRouter(appRoutes), provideServiceWorker('ngsw-worker.js', {
        enabled: !isDevMode,
        registrationStrategy: 'registerWhenStable:30000'
    })
 ],
};

toaster.component.ts

import { ChangeDetectionStrategy, Component, effect, inject } from '@angular/core';
import { JsonPipe } from '@angular/common';
import { ToasterStore } from '@lib/stores';
import { getState } from '@ngrx/signals';

@Component({
  selector: 'lib-toaster',
  standalone: true,
  imports: [JsonPipe],
  templateUrl: './toaster.component.html',
  styleUrl: './toaster.component.scss',
  providers: [ToasterStore],
  changeDetection: ChangeDetectionStrategy.OnPush
})


export class ToasterComponent {
  readonly store = inject(ToasterStore);

  constructor(){
    effect(() => {
      const state = getState(this.store);
      console.log(state, 'toaster state changed')
    })
  }
}

package.json

{
  "name": "@lib/source",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "angular-CL": "npx nx list @nx/angular",
    "start:kingdom-lifter": "npx nx serve kingdom-lifter",
    "ssl:kingdom-lifter": "npx nx serve kingdom-lifter --ssl true",
    "build:kingdom-lifter": "npx nx build --prod --project=kingdom-lifter",
    "pwa:kingdom-lifter": "npx nx build --prod --project=kingdom-lifter && http-server -p 8080 -c-1 dist/apps/kingdom-lifter/browser",
    "start:backend": "node server.js"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~18.0.0",
    "@angular/common": "~18.0.0",
    "@angular/compiler": "~18.0.0",
    "@angular/core": "~18.0.0",
    "@angular/forms": "~18.0.0",
    "@angular/platform-browser": "~18.0.0",
    "@angular/platform-browser-dynamic": "~18.0.0",
    "@angular/router": "~18.0.0",
    "@angular/service-worker": "~18.0.0",
    "@nx/angular": "19.3.0",
    "@testing-library/user-event": "^14.5.2",
    "axios": "^1.6.0",
    "bcryptjs": "^2.4.3",
    "express": "~4.18.1",
    "jsonwebtoken": "^9.0.2",
    "mongoose": "^8.4.3",
    "mongoose-unique-validator": "^5.0.0",
    "multer": "^1.4.5-lts.1",
    "nodemailer": "^6.9.14",
    "rxjs": "~7.8.0",
    "ts-mockery": "^1.2.0",
    "tslib": "^2.3.0",
    "zone.js": "~0.14.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~18.0.0",
    "@angular-devkit/core": "~18.0.0",
    "@angular-devkit/schematics": "~18.0.0",
    "@angular-eslint/eslint-plugin": "^18.0.1",
    "@angular-eslint/eslint-plugin-template": "^18.0.1",
    "@angular-eslint/template-parser": "^18.0.1",
    "@angular/compiler-cli": "~18.0.0",
    "@angular/language-service": "~18.0.0",
    "@angular/pwa": "^18.0.5",
    "@ngrx/signals": "^17.2.0",
    "@nx/devkit": "19.3.0",
    "@nx/esbuild": "19.3.0",
    "@nx/eslint": "19.3.0",
    "@nx/eslint-plugin": "19.3.0",
    "@nx/jest": "19.3.0",
    "@nx/js": "19.3.0",
    "@nx/node": "^19.3.0",
    "@nx/playwright": "19.3.0",
    "@nx/workspace": "19.3.0",
    "@playwright/test": "^1.36.0",
    "@schematics/angular": "~18.0.0",
    "@swc-node/register": "~1.9.1",
    "@swc/core": "~1.5.7",
    "@swc/helpers": "~0.5.11",
    "@testing-library/angular": "^16.0.0",
    "@testing-library/jest-dom": "^6.4.6",
    "@types/express": "~4.17.13",
    "@types/jest": "^29.4.0",
    "@types/node": "18.16.9",
    "@typescript-eslint/eslint-plugin": "^7.3.0",
    "@typescript-eslint/parser": "^7.3.0",
    "@typescript-eslint/utils": "^8.0.0-alpha.28",
    "esbuild": "^0.19.2",
    "eslint": "~8.57.0",
    "eslint-config-prettier": "^9.0.0",
    "eslint-plugin-playwright": "^0.15.3",
    "jest": "^29.4.1",
    "jest-environment-jsdom": "^29.4.1",
    "jest-environment-node": "^29.4.1",
    "jest-preset-angular": "~14.1.0",
    "jwt-decode": "^4.0.0",
    "nx": "19.3.0",
    "prettier": "^2.6.2",
    "ts-jest": "^29.1.0",
    "ts-node": "10.9.1",
    "typescript": "~5.4.2"
  }
}

I have uninstalled angular cli and re installed. I have made another project from scratch and made a simple service and tried to replicate and it fails also. I am not sure of what the issue could be at this point.