mt:ArchiveList date context not as documented in 5.2.3

gistfile1.xml

<mt:Ignore>
  Want to do it like this, but it's outputting all months for every year... 
  http://www.movabletype.org/documentation/appendices/tags/archivelist.html
  "Here, we're combining two ArchiveList tags (the inner ArchiveList tag is bound to the date range of the year in context)"

  <mt:ArchiveList type="Yearly">
    <mt:ArchiveListHeader><ul></mt:ArchiveListHeader>
    <li><a href="<$mt:ArchiveLink$>"><$mt:ArchiveDate format="%Y"$></a>: </li>
    <mt:ArchiveList type="Monthly" sort_order="ascend">
      <mt:ArchiveListHeader><li></mt:ArchiveListHeader>
      <a href="<$mt:ArchiveLink$>"><$mt:ArchiveDate format="%b"$></a>
      <mt:Unless name="__last__"> / </mt:Unless>
      <mt:ArchiveListFooter></li></mt:ArchiveListFooter>
    </mt:ArchiveList>
    <mt:ArchiveListFooter></ul></mt:ArchiveListFooter>
  </mt:ArchiveList>
</mt:Ignore>

<mt:ArchiveList type="Yearly">
  <mt:ArchiveListHeader><ul></mt:ArchiveListHeader>
  <$mt:ArchiveDate format="%Y" setvar="outer_year"$>
  <li><a href="<$mt:ArchiveLink$>"><$mt:ArchiveDate format="%Y"$></a>: </li>
  <li style="margin-bottom:10px;">
    <$mt:Var name="months" value=""$>
    <mt:ArchiveList type="Monthly" sort_order="ascend">
        <$mt:ArchiveDate format="%Y" setvar="inner_year"$>
        <mt:If name="outer_year" eq="$inner_year">
          <mt:SetVarBlock function="push" name="months">
            <a href="<$mt:ArchiveLink$>"><$mt:ArchiveDate format="%b"$></a>
          </mt:SetVarBlock>
        </mt:If>
    </mt:ArchiveList>
    <mt:Loop name="months">
      <$mt:Var name="__value__"$>
      <mt:Unless name="__last__"> / </mt:Unless>
    </mt:Loop>
  </li>
  <mt:ArchiveListFooter></ul></mt:ArchiveListFooter>
</mt:ArchiveList>