Last dynamics line doesn't stick to the above staff group

[Pavel Roskin]

Hello!

I'm trying to use explicit dynamics contexts to align dynamics, avoid
duplicates and position pedal marks as in the original score, as
suggested here:

http://lilypond.org/doc/v2.15/Documentation/learning/piano-templates

But when using \pageBreak, the lowest dynamics line doesn't stay with
the above staves.  Instead, it's positioned in the middle between staff
groups.

In this example, I'm using ragged-last-bottom to keep the example on
one page.

The problem is reproducible with today's mainline Lilypond (commit
0c61221b46addec50e2406e04af44a7d460443d4).

I consider it a bug.  I'll appreciate if somebody suggests a workaround.

-- 
Regards,
Pavel Roskin

loose-dynamics.png
Description: PNG image