Children routes working only when redirected

I have interesting problem when using children routes in Angular. The route is only working when there is a redirection to this "non-working" route.

In my browser if I type localhost:4200/customer/add/, the error is 404. But if I type localhost:4200/customer (this route is redirected to customer/add) the page is working.

My routing-module:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Routes, RouterModule } from '@angular/router';

import { AuthenticationLayoutComponent } from '../../components/authentication-layout/authentication-layout.component';
import { LoginComponent } from 'src/app/components/authentication/login/login.component';
import { AddCustomerComponent } from 'src/app/components/customer/add-customer/add-customer.component';

import { RegisterComponent } from 'src/app/components/authentication/register/register.component';
import { MasterLayoutComponent } from 'src/app/components/master-layout/master-layout.component';

const routes: Routes = [
  {
    path: 'customer',
    component: MasterLayoutComponent,
    children: [
      { path: "", redirectTo: 'add',pathMatch: 'full' },
      { path: "add", component: AddCustomerComponent},
    ],
  },
  {
    path: '',
    component: AuthenticationLayoutComponent,
    children: [
      { path: 'login', component: LoginComponent },
      { path: 'register', component: RegisterComponent },
    ],
  },
];

@NgModule({
  declarations: [],
  providers: [],
  imports: [
    CommonModule,
    RouterModule.forRoot(routes, { enableTracing: false }),
  ],
  exports: [RouterModule],
})
export class AppRoutingModule {}

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