Ng Select (scrollToEnd) emits the event only once

I am using ng-select version 9.0.1. The (scrollToEnd) emits the event only once.

<ng-select (scrollToEnd)="test($event)" [virtualScroll]="true" [items]="usersList" bindLabel="name" bindValue="id"></ng-select>


I am loading certain number of items when the scrollbar reaches to end

test(e) {
console.log('Event', e)
console.log(this.usersList)
for (let index = 0; index < 30; index++) {
this.usersList = [...this.usersList, {id: 1, name: 'New item'+index}];
}
}

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