[Table ] Table在虚拟滚动+合并单元格场景，滚动时会出现合并单元格消失

[Eviwang]

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

Reproduction link

https://playground.idux.site/#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

Steps to reproduce

What is expected?

期望正常滚动，单元格不消失

What is actually happening?

滚动时合并单元格消失了

Environment Info

Any additional comments? (optional)