### What problem does this PR solve?
Support the case of one cell split by multiple columns. Besides, the
codes are compatible with the common cell case.
#8606 can be fixed.
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

I provide a case of one cell split by multiple columns:

[test.xlsx](https://github.com/user-attachments/files/21578693/test.xlsx)

The chunk res:
<img width="236" height="57" alt="2025-06-17 16-04-07 的屏幕截图"
src="https://github.com/user-attachments/assets/b0a499ac-349d-4c3d-8c6e-0931c8fc26de"
/>