virtual-scroll doesn't work well with animate.leave

从 src/main.ts 中链接的 StackBlitz 复现开始，并在滚动时复现 cdkVirtualForTemplateCacheSize 的两种设置。跟踪 virtual-scroll 的入口点和动画行为；完成的标准是，缓存的行不再保留 leave 类或变为隐藏状态，并且未缓存的行在慢速和正常滚动以及快速滚动期间都会被移除。

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

virtual-scroll

Is this a regression?

No

Description

1. With a default cdkVirtualForTemplateCacheSize set to 20 virtuall-scroll keeps leave class on a template and uses this template for next row generation; in that case, new rows turn out to be hidden.
2. With a cdkVirtualForTemplateCacheSize set to 0 to disable cache virtuall-scroll do not remove rows while slow/normal scroll speed, and only removes on a high speed scrolling.

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-n4xn2i7p?file=src%2Fmain.ts

Please provide the exception or error you saw

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

Angular CLI       : 21.2.2
Angular           : 21.2.4
Node.js           : 22.22.0
Package Manager   : npm 10.8.2
Operating System  : linux x64

┌───────────────────────────┬───────────────────┬───────────────────┐
│ Package                   │ Installed Version │ Requested Version │
├───────────────────────────┼───────────────────┼───────────────────┤
│ @angular/animations       │ 21.2.4            │ ^21.2.4           │
│ @angular/build            │ 21.2.2            │ ^21.2.2           │
│ @angular/cli              │ 21.2.2            │ ^21.2.2           │
│ @angular/common           │ 21.2.4            │ ^21.2.4           │
│ @angular/compiler         │ 21.2.4            │ ^21.2.4           │
│ @angular/compiler-cli     │ 21.2.4            │ ^21.2.4           │
│ @angular/core             │ 21.2.4            │ ^21.2.4           │
│ @angular/forms            │ 21.2.4            │ ^21.2.4           │
│ @angular/material         │ 21.2.2            │ ^21.2.2           │
│ @angular/platform-browser │ 21.2.4            │ ^21.2.4           │
│ @angular/router           │ 21.2.4            │ ^21.2.4           │
│ rxjs                      │ 7.8.2             │ ^7.8.1            │
│ typescript                │ 5.9.3             │ ^5.9.3            │
│ zone.js                   │ 0.16.0            │ ^0.16.0           │
└───────────────────────────┴───────────────────┴───────────────────┘

Anything else?

No response