返信ありがとうございます。
問題自体は、API側のレスポンスヘッダー（Cache-Control）に no-cache 設定を入れることでIEにも無理やり対応させました。
ただ、上記対応ではちょっと違和感があるので、引き続きご知見を頂ければと思います。
以下、ng versionした結果です。
C:\git\mplace>ng version
Angular CLI: 8.0.3
Node: 10.16.0
OS: win32 x64
Angular: 8.0.1
… animations, cdk, common, compiler, compiler-cli, core, forms
… language-service, material, material-moment-adapter
… platform-browser, platform-browser-dynamic, router
Package Version
@angular-devkit/architect 0.800.3
@angular-devkit/build-angular 0.800.3
@angular-devkit/build-optimizer 0.800.3
@angular-devkit/build-webpack 0.800.3
@angular-devkit/core 8.0.3
@angular-devkit/schematics 8.0.3
@angular/cli 8.0.3
@angular/http 7.0.0
@ngtools/webpack 8.0.3
@schematics/angular 8.0.3
@schematics/update 0.800.3
rxjs 6.5.2
typescript 3.4.5
webpack 4.30.0
また、polyfils.ts の内容は以下です。
/**
* This file includes polyfills needed by Angular and is loaded before the app.
* You can add your own extra polyfills to this file.
*
* This file is divided into 2 sections:
* 1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
* 2. Application imports. Files imported after ZoneJS that should be loaded before your main
* file.
*
* The current setup is for so-called "evergreen" browsers; the last versions of browsers that
* automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
* Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
*
* Learn more in https://angular.io/guide/browser-support
*/
/***************************************************************************************************
* BROWSER POLYFILLS
*/
/** IE10 and IE11 requires the following for NgClass support on SVG elements */
import 'classlist.js'; // Run `npm install --save classlist.js`.
/** IE10 and IE11 requires the following for the Reflect API. */
import 'core-js/es6/reflect';
/**
* Required to support Web Animations `@angular/platform-browser/animations`.
* Needed for: All but Chrome, Firefox and Opera. http://caniuse.com/#feat=web-animation
**/
import 'web-animations-js'; // Run `npm install --save web-animations-js`.
/**
* By default, zone.js will patch all possible macroTask and DomEvents
* user can disable parts of macroTask/DomEvents patch by setting following flags
*/
// (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
// (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
// (window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
/*
* in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
* with the following flag, it will bypass `zone.js` patch for IE/Edge
*/
// (window as any).__Zone_enable_cross_context_check = true;
/***************************************************************************************************
* Zone JS is required by default for Angular itself.
*/
import 'zone.js/dist/zone'; // Included with Angular CLI.
/***************************************************************************************************
* APPLICATION IMPORTS
*/
