{{last}} is not defined inside {{archives}}

I know {{^last}}{{/last}} does work on Blot in principle, considering this question.

However, it does not seem to work with {{#entries}}, even though some templates try to make use of it. Specifically, I am talking about the "Index" template, which tries to do the following on its archives.html part:

  {{#entries}}
  <a class="archive" href="{{{url}}}">{{title}}</a>{{^last}}&nbsp;&nbsp;·&nbsp;{{/last}}
  {{/entries}}

In case of three posts in a single month, e. g. "abc", "def" and "ghi", I would expect the following to appear on the archives page:

abc  ·  def  ·  ghi

However, the {{^last}}{{/last}} block never seems to be executed, which leaves me with:

abc def ghi

(The spaces are probably added because of the line break in the HTML code.) I suspect that the items of {{#entries}} do not even have a last-property, which is why Mustache evaluates it to "false" (for all items)? Or is there some other problem? This happens with a freshly forked "Index" template, so I think it should work out of the box.