tour漫游式引导，target设置为null时mask无法阻止点击

[Roywhite]

trafficstars

• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Version

4.2.5

Environment

Windows 10 19045.4780, Microsoft Edge 版本 125.0.2535.92，Vue 3.5.8

Reproduction link

https://next.antdv.com/components/tour-cn

Steps to reproduce

将step的target设置为null后，mask区域仍能触发各种事件，官网的也是这样（关于位置的那个例子）

What is expected?

当target为null时，mask区域不触发事件

What is actually happening?

能触发事件