ng-server-context="ssr" on prerendered (SSG) parameterized routes

[vzarskus]

Which @angular/* package(s) are the source of the bug?

platform-server

Is this a regression?

No

Description

Hello!

I have noticed that when prerendering with Angular19 parameterized routes feature (https://angular.dev/guide/hybrid-rendering#parameterized-routes), these prerendered index.htmls contain ng-server-context="ssr", which is odd, because I would expect them to have ng-server-context="ssg" - same as not parameterized routes.

I will give you some examples in pictures.

Here we see browser/translations/index.html have ng-server-context="ssg":

Here we see two parameterized routes on browser/translations/irasu-valdymo-teorija/index.html and browser/translations/programines-irangos-inzinieriu-humoras/index.html having ng-server-context="ssr":

Is this intended?

Here is the relevant excerpt from app.routes.server.ts:

{
    path: 'translations/:slug',
    renderMode: RenderMode.Prerender,
    getPrerenderParams(): Promise<Record<string, string>[]> {
      return Promise.resolve(
        ['irasu-valdymo-teorija', 'programines-irangos-inzinieriu-humoras'].map(
          i => ({ slug: i }),
        ),
      );
    },
  },

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 19.1.1
Node: 20.18.0
Package Manager: npm 11.0.0
OS: win32 x64

Angular: 19.1.1
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser      
... platform-browser-dynamic, platform-server, router, ssr

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1901.1
@angular-devkit/build-angular   19.1.1
@angular-devkit/core            19.1.1
@angular-devkit/schematics      19.1.1
@angular/cdk                    19.1.0
@schematics/angular             19.0.6
ng-packagr                      19.0.1
rxjs                            7.8.1
typescript                      5.6.3
zone.js                         0.15.0

Anything else?

No response