How to display a section so that it would not disappear when entering it?

Question

1C-Bitrix

Hello!
Wrote the output of sections 1 and 2 levels.

$tree = CIBlockSection::GetTreeList(
  $arFilter=Array('IBLOCK_ID' => $iblock['ID'], 'SECTION_ID' => $arParams["CUR_SECTION"], 'CNT_ACTIVE' => true),
  $arSelect=Array('*')
);


while($arSection = $tree->GetNext()) {
  $cont_element = CIBlockSection::GetSectionElementsCount($arSection["ID"], Array("CNT_ACTIVE"=>"Y"));

  ?>
  <li>
    <span class="link"><a href="<?=$arSection['SECTION_PAGE_URL']?>"><?=$arSection['NAME'];?></a></span>
    <span class="count"><?=$cont_element?></span>
  </li>
  <?
}

But now the problem is, for example, I go to the 1st level section and the section disappears, I go to the 2nd level and also disappears. How to do what if the sections did not disappear when entering the 1st level or the second? I hope I explained clearly

Answer 1

calculate the partition tree separately, without a specific partition filter, and separately an entry with a specific partition filter
PS I hope I understood correctly)

Answer 2

Why didn't catalog.section.list suit you? There you add result_modifier.php in it, add your logic and get the necessary data into the resulting array, then work with this data in the template.