directory-tree无法自定义图标(directory-tree's icon cannot be customized)

[lchrennew]

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

Version

2.0.0-rc.1

Environment

Mac, Chrome 86, Vue3.0.2

Reproduction link

Steps to reproduce

treeData: [
{ title: '根目录', key: '', slots: { icon: 'folder' } },
{ title: '版本基线', key: '#tags', slots: { icon: 'tags' } },
{ title: '收藏', key: '#favorite', slots: { icon: 'heart' } },
{ title: '回收站', key: '#deleted', slots: { icon: 'delete' } },
],

<a-directory-tree
:load-data="loadData"
:tree-data="treeData"
show-icon
block-node
@select="onSelect"
>
<template #folder>
<FolderOutlined/>
</template>
<template #tags>
<TagsOutlined/>
</template>
<template #heart>
<HeartOutlined/>
</template>
<template #delete>
<DeleteOutlined/>
</template>
</a-directory-tree>

What is expected?

display customized icons

What is actually happening?

icon is not customized

[github-actions]

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