<Breadcrumb.Separator /> can't be customized when creating a component on top of <Breadcrumb.Item />

[artrn-nt]

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

Reproduction link

Steps to reproduce

Open the link, script runs to show the problem.

What is expected?

Hello * Cherry * House * Tree

What is actually happening?

Hello / * Cherry / * House / * Tree / *

Environment	Info
antd	4.16.0
React	17.0.2
System	macOS
Browser	Chrome Version 90.0.4430.212

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Saw this in the documentation: "When using Breadcrumb.Separator,its parent component must be set to separator="", otherwise the default separator of the parent component will appear."

But it has no effect.

[afc163]

trace #4853