MergeVertically not working on Rows[0].Cells[0]

[chen39636]

I want to merge the cells vertically at Rows[0].Cells[0] and Rows[1].Cells[0], but when calling the following, nothing happens, the cells are not merged.
table.Rows[0].Cells[0].MergeVertically(1);

I was able to merge the cells vertically at Rows[1].Cells[0] and Rows[2].Cells[0] without problem. The following works fine.
table.Rows[1].Cells[0].MergeVertically(1);

So issue seems to be with Rows[0].Cells[0]

[PrzemyslawKlys]

Probably a bug that needs addressing