Error using experimentalPlatform neutral with provideAnimationsAsync

[fiste788]

Command

build

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

When using new experimentalplatform neutral with provideAnimationsAsync() in app.config.ts i have on build

Minimal Reproduction

I have a repro here https://github.com/fiste788/tmp-animations-async
Cloning, running npm install and npm run build will give you the error.
If you change to provideAnimations() without async at line
https://github.com/fiste788/tmp-animations-async/blob/562c37a48c9f0c0a52f6ffacbdc5faec25dfe0d5/src/app/app.config.ts#L8
to make the build work.

Exception or Error

TypeError: Class extends value undefined is not a constructor or null
    at file:///D:/Projects/Personal/Fantamanajer/test19v2/.angular/prerender-root/a3011629-d592-49a7-91c1-a8b6d1656845/chunk-GFZLE2P2.mjs:34:17047
    at file:///D:/Projects/Personal/Fantamanajer/test19v2/.angular/prerender-root/a3011629-d592-49a7-91c1-a8b6d1656845/chunk-GFZLE2P2.mjs:34:17240
    at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:336:24)
    at async importModuleDynamicallyWrapper (node:internal/vm/module:429:15)
    at async extractRoutes (D:\Projects\Personal\Fantamanajer\test19v2\node_modules\@angular\build\src\utils\server-rendering\routes-extractor-worker.js:23:83)
    at async D:\Projects\Personal\Fantamanajer\test19v2\node_modules\piscina\dist\worker.js:144:26

Your Environment

Angular CLI: 19.0.1
Node: 18.20.3
Package Manager: bun <error>
OS: linux x64

Angular: 19.0.0
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1900.1
@angular-devkit/build-angular   19.0.1
@angular-devkit/core            19.0.1
@angular-devkit/schematics      19.0.1
@angular/cli                    19.0.1
@angular/ssr                    19.0.1
@schematics/angular             19.0.1
rxjs                            7.8.1
typescript                      5.6.3
zone.js                         0.15.0

Anything else relevant?

No response