Timeline with nzPending and nzReverse borken if initiated with nzReverse=true

[whittssg]

Reproduction link

https://stackblitz.com/edit/angular-svfa4s?file=src/app/app.component.ts

Steps to reproduce

If you set reverse = false in the component (like in the docs) then the nzPending shows correctly, flipping it with the button so that reverse = true after its loaded also shows it correctly. Setting reverse = true at the beginning causes strange behavior.

What is expected?

to be able to set nzReverse to true from the start

What is actually happening?

Setting nzReverse to true from the start causes the component to look strange (nzPending is still at the bottom but all messed up).

Environment	Info
ng-zorro-antd	8.5.2
Browser	Chrome Latest 64bit

[zorro-bot]

Hello @whittssg. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please fill the Pull Request Template here, provide documentation/test cases if needed and make sure CI passed, we will review it soon. Appreciate it advance and we are looking forward to your contribution!

你好 @whittssg, 我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。请务必填写 Pull Request 内的预设模板，提供改动所需相应的测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献！