Yes, it seems to be intended because images are not stored inside the cells, but rather inside a sheet. They are part of a separate collection, the ExcelWorksheet.Pictures.
So, perhaps you could iterate through that collection and copy the required elements.
For example, something like the following:
ExcelFile book = ExcelFile.Load("sv-data.xlsx");
ExcelWorksheet sheet1 = book.Worksheets[0];
CellRange range1 = sheet1.NamedRanges["SV"].Range;
ExcelWorksheet sheet2 = book.Worksheets.Add("Sheet2");
int row2 = 14;
int column2 = 3;
range1.CopyTo(sheet2, row2, column2);
int rowOffset = row2 - range1.FirstRowIndex;
int columnOffset = column2 - range1.FirstColumnIndex;
foreach (ExcelPicture picture1 in sheet1.Pictures)
{
ExcelDrawingPosition position1 = picture1.Position;
CellRange pictureRange1 = sheet1.Cells.GetSubrangeAbsolute(position1.From.Row.Index, position1.From.Column.Index, position1.To.Row.Index, position1.To.Column.Index);
if (range1.Overlaps(pictureRange1))
{
ExcelPicture picture2 = sheet2.Pictures.AddCopy(picture1);
ExcelDrawingPosition position2 = picture2.Position;
position2.From.Row = sheet2.Rows[position2.From.Row.Index + rowOffset];
position2.To.Row = sheet2.Rows[position2.To.Row.Index + rowOffset];
position2.From.Column = sheet2.Columns[position2.From.Column.Index + columnOffset];
position2.To.Column = sheet2.Columns[position2.To.Column.Index + columnOffset];
}
}
book.Save("output.xlsx");