Dot getting divorced on dotted note

[nick . payne]

I'm setting a piece in three voices (guitar arrangement of Schubert's song Ständchen). The problem is that when the top voice has a dotted chord that results in the notes being offset left/right of the stem, this results in the dot on the note in the bass voice getting separated from the note. This snippet shows the problem. I know I can use \override #'extra-offset to move the dot, which is what I have been doing, but is this expected behaviour or a bug? I couldn't find anything in the documentation mentioning this.
 
 
\version "2.13.3"
 
\relative c' {
 
\time 3/4
 
<<
 
{
 
    <e' d>2.
 
}
 
\\
 
{
 
    g,8\rest e[ gis e gis e]
 
}
 
\\
 
{
 
    \stemDown
 
    e,2.
 
}
 
>>
 
}
 
 
Nick

test.png
Description: PNG image