HTML nested ol rendering differences

Describe the issue

Sample code

              <t>nested ol</t>
              <ol>
                <li>
                  <ol>
                    <li>This is first nested li</li>
                    <li><t>second nested li</t></li>
                  </ol>
                </li>
                <li><t>second parent li</t></li>
              </ol>
              <t>nested ol with type="%p%d"</t>
              <ol>
                <li>
                  <ol type="%p%d">
                    <li>This is first nested li</li>
                    <li><t>second nested li</t></li>
                  </ol>
                </li>
                <li><t>second parent li</t></li>
              </ol>
              <t>nested ol with type="%d"</t>
              <ol>
                <li>
                  <ol type="%d">
                    <li>This is first nested li</li>
                    <li><t>second nested li</t></li>
                  </ol>
                </li>
                <li><t>second parent li</t></li>
              </ol>
              <t>nested ul</t>
              <ul>
                <li>
                  <ul>
                    <li>This is first nested li</li>
                    <li><t>second nested li</t></li>
                  </ul>
                </li>
                <li><t>second parent li</t></li>
              </ul>