[Bug Report] el-tabs在子组件中不能动态拿到选项数据，
Open
- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.9
### OS/Browsers version
单位个人股
### Vue version
2.7.10
### Reproduction Link
https://github.com/ElemeFE/element/blob/dev/FAQ.md#常见问题
### Steps to reproduce
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### What is Expected?
https://github.com/ElemeFE/element/blob/dev/FAQ.md#常见问题
### What is actually happening?
https://github.com/ElemeFE/element/blob/dev/FAQ.md#常见问题
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