potential bug: crescendi not on same line

[Graham Percival]

Again, I don't know enough about engraving to definitely call this a 
bug, but it looks a bit weird to me -- I thought that all dynamics on 
one line of music be at the same level.

\version "2.3.16"
{ \relative c'{
\clef alto
\time 3/4
 f4\< e b
\time 5/8
 c4.\!\>( ~ c8[ b]) a4. ~ a4\!
 f4.\< e4
\time 2/4 d4 f4
\time 5/8
<a c,>8[\!\f-.-> <a c,>-. <a c,>]-. <a c,>[-.-> <a c,>]-.
}}