anomolous page breaks

[David Bobroff]

I'm transposing an orchestra part.  I want to keep line/page breaks the
same as the original part.  To that end I'm using \break and \pageBreak
(Lilypond 2.3.17). The part should be four pages long with the system
count being 10, 12, 12, 11.  Instead, I get six pages with the system
count; 10, 6, 6, 6, 6, 11.  I have placed \break at the end of each line
to match the original as well as placing \pageBreak at the end of each
page.  Bug?  Feature?  User error?

-David