Copy a row in table that contains merge cell will remove the above row

Issue Summary

If a table contains merge cell, adding a new row at the bottom and copy the cell data from previous row will remove the above row.
PS: Tested in version 7.14 and the issue does not occur there.

Steps to Reproduce

1. Create a table with 4 row and 3 column
2. Merge the 3 column into one column in first row
3. Add content to all the column
4. Add new row at bottom
5. Copy the cell data of row 2 and paste it at the newly added row
6. You will notice the row before the newly added row will be removed
   For details, please review following video
   Recording #12.mp4

Expected Results

Previous row remain when new row is added

Actual Results

Previous row is removed

Workaround

Manually add the data instead of pasting the cell data to new row.