tie direction problem in 2.2.4

[Werner LEMBERG]

>From the info file:

    The `\override' must be done before the object is started.
  Therefore, when altering _Spanner_ objects, like slurs or beams, the
  `\override' command must be executed at the moment when the object
  is created.

It seems that it doesn't always work as expected.  For example, I
want to change the direction of a tie like this (normally, you need
this in chords):

      _________
     /         \
    o           o          o
                 \________/


I tried the file below, but the ties are always in the same direction.
Am I doing something wrong, or is this a bug?


    Werner


======================================================================

%
% This file shows problems with ties in lilypond 2.2.4
%
% . The advertised method to change the direction of a tie before the
%   tie object is created seems to fail.  In the example below, both
%   ties go down.

\version "2.2.4"

\score {
  \notes \relative c' {
    \tieUp c1 ~ \tieDown c ~ c
  }

  \paper {
    indent = 0.0\mm
    linewidth = 70.0\mm
  }
}

% EOF