bug(cdk Scrolling): Angular 19 cdk scrolling initial only load 5 items when configure architect "builder": "@angular/build:application"

[lujian98]

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

Didn't test with Angular 18.

Description

With angular 19, if configure architect: "builder": "@angular/build:application", the cdk scrolling initial only load 5 items into the view.
Same issue with "builder": "@angular-devkit/build-angular:application".

It works fine with "builder": "@angular-devkit/build-angular:browser"

Reproduction

StackBlitz link: https://stackblitz.com/edit/stackblitz-starters-dehjwctw?file=angular.json
Steps to reproduce:

1. Just load the above StackBlitz demo

Expected Behavior

It should display as below to load all the items into the view.

Actual Behavior

the cdk scrolling initial only load 5 items into the view.

Environment

• Angular: 19
• CDK: 19
• Browser(s): Chrome and FF
• Operating System: Ubuntu 24