While adding a new row to a table when there are merged cells present, the new row's merge behavior is inconsistent.
|Cell merge type on current row||New row position||Result|
|Cells merged across columns||Insert above||Cells in new row copies the current row's merges|
|Cells merged across columns||Insert below||Cells in new row copies the current row's merges|
|Cells merged across rows||Insert above||Cells in new row does not extend the current row's merged cells|
|Cells merged across rows||Insert below||Cells in new row extends the current row's merged cells|
The third scenario stands out from the rest as it does not not extend the merged cells, and instead inserts a standalone cell above the merged cells. It appears to duplicate the row formatting from the row above instead of using the current row's formatting.
The fourth scenario inserts a row below, and it does correctly extend the merged cells so that now the merge is one cell longer.