Angular 9 ssr服务器模块转换功能未运行，为什么？

Question

我有一个angular 9应用程序，该应用程序具有用于浏览器和服务器的不同模块，所有功能在不久前都可以运行，但是现在我注意到我的服务器模块的功能根本无法启动。

app.server.module.ts：

import { NgModule } from '@angular/core';
import { ServerModule, ServerTransferStateModule } from '@angular/platform-server';
import { BrowserModule, TransferState } from '@angular/platform-browser';

import { AppModule } from './app.module';
import { AppComponent } from './app.component';
import { TranslateServerLoader } from './translate-server-loader.service';
import { TranslateModule, TranslateLoader } from '@ngx-translate/core';

export function translateFactory(transferState: TransferState) {
  return new TranslateServerLoader('/assets/i18n','.json', transferState);
}

@NgModule({
  imports: [
    AppModule,
    ServerModule,
    ServerTransferStateModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: translateFactory,
        deps: [TransferState]
      }
    }),
    BrowserModule.withServerTransition({ appId: 'test' }),
  ],
  bootstrap: [AppComponent],
})
export class AppServerModule { }

和TranslateServerLoader的功能：

import { Observable } from "rxjs";
import { TranslateLoader } from '@ngx-translate/core';

declare var require: any;
import { join } from 'path';
import { makeStateKey, StateKey, TransferState } from '@angular/platform-browser';

const fs = require('fs');

export class TranslateServerLoader implements TranslateLoader {

    constructor(private prefix: string = 'i18n',
        private suffix: string = '.json',
        private transferState: TransferState) {
    }

    public getTranslation(lang: string): Observable<any> {
        console.log('translating in server....');
        return Observable.create(observer => {
            const assets_folder = join(process.cwd(), 'dist', 'autorent', 'browser', this.prefix);
            console.log('TEST PATH - ', assets_folder);

            const jsonData = JSON.parse(fs.readFileSync(`${assets_folder}/${lang}${this.suffix}?v2`, 'utf8'));
            // Here we save the translations in the transfer-state
            const key: StateKey<number> = makeStateKey<number>('transfer-translate-' + lang);
            this.transferState.set(key, jsonData);

            observer.next(jsonData);
            observer.complete();
        });
    }
}

因此从未调用过称为 getTranslation（）的函数，因为在运行服务器时看不到任何控制台日志，为什么？