Bug with postscript in markups

[Gianluca D'Orazio]

Hello, I'm writing to point out a strange behaviour with /postscript command 
inside a /markup command.
I'm using lilypond 2.7.32-1 on SuSE-Linux, but the bug occurs even with 
lilypond 2.6.4.3.
Until a postscript drawing is set on the first page, everything goes well; but 
when the drawing appears on another page, the linewidth is inexplicably made 
larger and the postscript setting "linewidth" doesn't work.
This is the snippet of code with which I reproduced the bug (I previously 
noticed it in a normal score):

%%%%%%%% snippet start %%%%%%%%%%%%%%

\relative c'' { 
  a1-\markup { \postscript #"3 4 moveto 5 3 rlineto stroke" } \pageBreak
  b-\markup { \postscript #"3 4 moveto 5 3 rlineto stroke" } \pageBreak
  b-\markup { \postscript #"3 4 moveto 5 3 rlineto stroke" }
}

%%%%%%%% snippet end %%%%%%%%%%%%%%

Thank you for paying attention to my message and thank you for your great job 
too.

Best regards,

Gianluca D'Orazio