Strange placement of rests when using \stemNeutral

[ornello]

I have found a strange effect when using \stemNeutral. In the following
snippet some of the rests belonging to voice 1 are placed below the note in
voice 2:

{
\new Staff <<
\key d \major
\numericTimeSignature \time 3/8
\clef bass
\new Voice {
\voiceOne
\stemNeutral
\clef violin
\bar "||"
r8
< dis'!
fis' > 16\staccato [ 
r16
< dis'
fis' > 16\staccato ] 
r16
}
\new Voice {
\voiceTwo
b4.
}
>>
}

When I omit \stemNeutral all rests are placed above the note as expected.

Is there any explanation of this behavior?

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