[2.11.65] \dotsDown doesn't work?

[Dmytro O. Redchuk]

Hello,

  i've cut four bars from two voices from some piece, SA-TB (two staves)
  (please see below the snippet, only tenor and bass, no lyrics).

  When lilypond produces whole piece, there is a "collision" in \bass:
  upper tie crosses lower dot (mmm... probably, not allways, but sometimes;-).

  For some reason, it does not happen in this snippet; but the question is --
  why \dotsDown does not work here (in chords of the second voice)?

% --- cut
\version "2.11.65"

tenor = \relative b {
  \clef "bass"
    \time 3/4
    \key g \major
    %
    \voiceOne
    b2. ~
    b2.
    %34
    b2. ~
    b2.
}

bass = \relative g {
  \clef "bass"
    \time 3/4
    \key g \major
    %
    \voiceTwo
    <d g,>2. ~
    <d g,>2.
    %34
    \dotsDown
    <d g,>2. ~
    <d g,>2.
}

{ << \tenor \bass >> }
% --- cut

-- 
Dmytro O. Redchuk