dot flips horizontal alignment of voices

[Urs Liska]

Hi,

The following code creates the attached result:

\version "2.21.0"

{
  \time 3/8
  <<
    {
      c''4. c''4.
    }
    \\
    {
      b'4. b'8 [ a' ]
    }
  >>
}

The first measure is what I expect while in the second measure the mixed 
dot situation flips the horizontal alignment.

I'm not sure if there is actually an explicit reason for that decision, 
but my customer wants me to have the second measure with the upper c'' 
on the left too.
It seems \voice commands don't have any effect, but I'm not totally sure.

Is there any easy fix for that short of manually pushing stuff around?

Thanks
Urs

(PS: note-to-self: it's 181_3)

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