docs: [DocViewer] Error preparing document, Loading chunk 10 failed.

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x ] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

When I go to a URL on angular.io (e.g. https://angular.io/api/animations/animate), sometimes the basic website loads, but the site content do not load. On a site reload (F5), the content gets displayed normally.

Following error is displayed in the console:

ERROR Error: [DocViewer] Error preparing document 'api/animations/animate': Error: Loading chunk 10 failed.
(error: https://angular.io/toc-toc-module-ngfactory.59481b14614c9d19ebd4.js)
    at HTMLScriptElement.a (runtime.b95c2950b9946468c610.js:1)
    at HTMLScriptElement.D (zone.js.pre-build-optimizer.js:1188)
    at e.invokeTask (zone.js.pre-build-optimizer.js:421)
    at Object.onInvokeTask (main.12cbd075231e48c67faf.js:1)
    at e.invokeTask (zone.js.pre-build-optimizer.js:420)
    at t.runTask (zone.js.pre-build-optimizer.js:188)
    at t.invokeTask [as invoke] (zone.js.pre-build-optimizer.js:496)
    at y (zone.js.pre-build-optimizer.js:1540)
    at HTMLScriptElement._ (zone.js.pre-build-optimizer.js:1566)
    at HTMLScriptElement.a (runtime.b95c2950b9946468c610.js:1)
    at HTMLScriptElement.D (zone.js.pre-build-optimizer.js:1188)
    at e.invokeTask (zone.js.pre-build-optimizer.js:421)
    at Object.onInvokeTask (main.12cbd075231e48c67faf.js:1)
    at e.invokeTask (zone.js.pre-build-optimizer.js:420)
    at t.runTask (zone.js.pre-build-optimizer.js:188)
    at t.invokeTask [as invoke] (zone.js.pre-build-optimizer.js:496)
    at y (zone.js.pre-build-optimizer.js:1540)
    at HTMLScriptElement._ (zone.js.pre-build-optimizer.js:1566)
    at e.selector (main.12cbd075231e48c67faf.js:1)
    at e.error (main.12cbd075231e48c67faf.js:1)
    at e._error (main.12cbd075231e48c67faf.js:1)
    at e.error (main.12cbd075231e48c67faf.js:1)
    at e._error (main.12cbd075231e48c67faf.js:1)
    at e.error (main.12cbd075231e48c67faf.js:1)
    at e._error (main.12cbd075231e48c67faf.js:1)
    at e.error (main.12cbd075231e48c67faf.js:1)
    at e.notifyError (main.12cbd075231e48c67faf.js:1)
    at e._error (main.12cbd075231e48c67faf.js:1)

Expected behavior

The website loads and displays the content.

Minimal reproduction of the problem with instructions

Happens on random cases, so is difficult to reproduce.

What is the motivation / use case for changing the behavior?

Viewing the docs without having to reload the page.

Environment

Angular version: -


Browser:
- [x] Chrome (desktop) version  69.0.3497.100
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[mahalde]

I can confirm that the issue seems to be gone on Version 7.0.1-build.51036+sha.6c48455.

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