Lilypond ignores some \shape commands in chords

[Arle Lommel]

% Cannot tweak both ties in a double tie.
% Lilypond 2.18.2 simply ignores the second one.
% This example has a deliberately bad example in
% the second \shape command to make it obvious where it
% is working or not, but *no* values change
% the output from the system. The second \shape command
% is completely ignored.
%
% There is some additional weirdness I will follow up with,
% where, if you have a string of ties and you insert a \break
% in the middle, it switches to ignoring the first one
% and honoring the second one in a chord.

\version "2.18.2"
\relative c'' {
        \tieUp
        <cis!-\shape #'((0.0 . 2.0) (0.0 . 2.0) (0.0 . 2.0) (0.0 . 2.0))~ 
e-\shape #'((0.0 . 5.0) (0.0 . 0.0) (0.0 . 0.0) (0.0 . 2.0))~>1 |
        <cis! e>1 |
}