Custom icons are hidden when tree components are loaded asynchronously

[Codevers]

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

Reproduction link

Steps to reproduce

When the tree is loaded asynchronously, loading appears and the custom icon disappears

What is expected?

Custom icons should not disappear

What is actually happening?

Custom icon disappears

Environment	Info
antd	4.1.1
React	16.12.0
System	macOS Mojave v10.14.6
Browser	Chrome v80.0.3987.163 64bit

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.ant-tree .ant-tree-treenode-loading .ant-tree-iconEle{ display:none }