Invert note head but keeping stem directions

[Jefferson dos Santos Felix]

How can I invert the note head position in this example, but keeping
stem directions, like the 2nd bar?

% This example causes a collision between the dot of b8. and the note a4
% How can I put the dotted note on the right, but keeping these stem directions?
% Is it a bug, or isn't?
\version "2.4.0"
\paper
{
        raggedright= ##t
        linewidth = 160\mm
        indent = 0\mm
}

\score
{
        \context Staff
        <<
                \clef "bass"
                { b8. c'16 d'4 b8  c'8  d'4 b2 b2  }
                \\
                { a4 g b2 b8. a16 g4 b8 a g4 }
        >>
        \layout {  }
}

-- 
jEfF_[Feliks]