By broken I mean failing to behave as the documentation says it should.
"In scores with many staves, a \bar
command in one staff is
automatically applied to all staves. The resulting bar lines are
connected between different staves of a StaffGroup
,
PianoStaff
, or GrandStaff
."
Are you
saying that the current behavior is intentional, that the Lilypond
developers think that is how those bar lines should look? I don't know that I've ever seen someone draw a chart like that. If this is how the program is intended to behave there is, of course, no need for a bug report.