bug(Select): Select menu height shrinks when scrolling

### Is this a regression?

- [x] 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 select menu is opened and scrolled out of view it's height becomes really small. When scrolling back into view the height never increases and stays small.

This issue is similar to already fixed issue in mat-menu component
https://github.com/angular/components/issues/18168
https://github.com/angular/components/pull/21436

### Reproduction

StackBlitz link: https://stackblitz.com/edit/zdrajstd?file=src%2Fexample%2Fselect-custom-trigger-example.html
Steps to reproduce:
1. Create a page large enough where you can scroll
2. Add a select component with a few options in the middle of the page
3. Scroll through the page while the select is open

### Expected Behavior

Select menu height should increase when scrolled back into view

### Actual Behavior

Select menu height doesn't increase and stays small.


### Environment

- Angular: 19.2.7,
- CDK/Material: 19.2.10
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

リンクされた StackBlitz の再現から始め、メニューを開いた状態でページをスクロールしながら Select コンポーネントを追跡します。メニューがビューポートから外れて再び入ったときの高さを比較します。期待される動作で説明されているとおり、再び表示範囲内に戻るまでスクロールした後に高さがもう一度広がれば完了です。

索引モデルが issue の本文から書いたものです。