级联选择组件自定义已选项后会出现 title="undefined" #8006
Description
Reproduction link
不需要，见下图
Steps to reproduce
官网文档
What is expected?
期望无title=“undefined”
What is actually happening?
有title=“undefined”
| Environment | Info |
|---|---|
| ng-zorro-antd | 16.0.0 |
| Browser | all |
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