Baroque NoteHeads won't merge without \new Voice

[David Poon]

When I use Baroque NoteHeads, noteheads in (temporary) different voices
refuse to merge--unless I specifically create a new voice context for both
voices (not just one as in the Temporary polyphonic passages example
https://lilypond.org/doc/v2.22/Documentation/notation/multiple-voices#single_002dstaff-polyphony
).

-----
\version "2.20.0"

\new Voice { \relative c'' {
\override NoteHead #'style = #'baroque
<<
% \new Voice
{ \voiceOne a b c }

\new Voice
{ \voiceTwo a g c }
>>
} }
-----

I.e., commenting out Baroque NoteHeads OR uncommenting \new Voice will both
give the desired output, but the code as-is duplicates noteheads.

-David