nz-back-top组件，用鼠标滚轮快速滚动到容器顶部，返回页面顶部的操作按钮未消失

[sharky556]

Reproduction link

https://stackblitz.com/edit/angular-ap8od5?file=src/app/app.component.ts

Steps to reproduce

1.先滚动到返回页面顶部按钮显示出来
2.多次快速滚动到顶部，返回页面顶部操作按钮未消失

What is expected?

返回页面顶部操作按钮消失

What is actually happening?

返回页面顶部操作按钮未消失

Environment	Info
ng-zorro-antd	11.4.2
Browser	chrome

[zorro-bot]

Translation of this issue:

NZ-Back-TOP components, quickly scroll to the top of the container with the mouse roller, return to the operation button at the top of the page does not disappear

reproduction link

[https://stackblitz.com/edit/angular-ap8od5?file=src/app/app.component.ts](https://stackblitz.com/edit/angular-ap8od5?file=src/app/App. Component.ts)

steps to reproduce

1. Scroll to the top button of the return page to display
2. Quickly scroll to the top multiple times, return to the top of the page does not disappear

What is expected?

Back to the top of the action button disappears

What is actually happens?

Back to the top of the action button does not disappear

ENVIRONMENT	INFO
Ng-Zorro-ANTD	11.4.2
Browser	Chrome