[alibaba/easyexcel]使用填充方式，写入多行数据后，在SheetWriteHandler#afterSheetCreate中，无法合并单元格

模板excel： merge_template.xlsx 向模板excel中填充数据，模板sheet2可以正常填充并合并；模板sheet1中无法合并，代码抛出异常：

Exception in thread "main" java.lang.IllegalStateException: Cannot add merged region B12:B13 to sheet because it overlaps with an existing merged region (A11:D13).

public class MergeTest {

    public static final int SHEET_NO_1 = 0;
    public static final int SHEET_NO_2 = 1;
    public static void main(String[] args) throws IOException {
        String fileName = "D:\\MergedExcel.xlsx";
        Resource resource = new ClassPathResource("/merge_template.xlsx");
        // 方案1
        try (ExcelWriter excelWriter = EasyExcel.write(fileName).inMemory(true).withTemplate(resource.getInputStream()).build()) {
            // 使用sheet2能生成目标文件，使用sheet1就会报错
            WriteSheet writeSheet = EasyExcel.writerSheet(SHEET_NO_1).registerWriteHandler(new SheetWriteHandler() {
                @Override
                public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
                    // 写10行数据，将第2列单元格，每两行行合并一次
                    Sheet sheet = writeSheetHolder.getSheet();
                    int startRow = 0;
                    for (int j = 0; j < 5; j++) {
                        int lastRow = startRow + 1;
                        System.out.println(String.format("%s_%s", startRow, lastRow));
                        CellRangeAddress cellRangeAddress = new CellRangeAddress(startRow, lastRow, 1, 1);
                        sheet.addMergedRegionUnsafe(cellRangeAddress);
                        startRow += 2;
                    }
                }}).build();
            excelWriter.fill(mockData(), FillConfig.builder().forceNewRow(true).build(), writeSheet);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("export success");
    }

    private static List<Map<String, String>> mockData() {
        List<Map<String, String>> dataList = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            Map<String, String> map = new HashMap<>();
            map.put("a", "1");
            map.put("b", "2");
            map.put("c", "3");
            map.put("d", "4");
            dataList.add(map);
        }
        return dataList;
    }
}

异常：

Exception in thread "main" java.lang.IllegalStateException: Cannot add merged region B12:B13 to sheet because it overlaps with an existing merged region (A11:D13).

想要的效果：